strange issue ?

Sounds like it is switching source to another device connected to your tv.
Could well be a hdmi-cec enabled device
Samsung call this Anynet+ (i think)
Here's an explanation of what hdmi-cec is:

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CEC stands for Consumer Electronics Control. Essentially HDMI-CEC-enabled gear, when connected by an HDMI cable, can be controlled through one remote without any programming or setup required. It is an optional part of the HDMI specification. Up to 10 connected devices, including the display, can be controlled via HDMI. CEC is a two-way communication system in which a device sends back an acknowledgement that it received a command, assuring that devices are in their proper state.
In Philips we market the HDMI-CEC feature under the name ‘EasyLink’. HDMI-CEC is an industry standard supported by many brands, under various proprietary names.

You could try disabling it in your image, i think it is in the plugins menu, or set it up for your vu remote to control your tv remote or vica versa.
It could also be a samsung app that someone has downloaded to their phone/tablet which lets them use it as a remote. Disconnecting your tv from the internet may solve it but you will loose your smart tv functionality if you do.
What else is connected to your tv?

Your vu ultimo remote can also function as a universal remote.
You could disable the hdmi-cec and programme your vu remote to control your tv on/off , source input and volume(all the essential stuff really)
Taken from the ultimo manual: (samsung code 2448)

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2-10. Remote Control Unit (RCU) Set-up
Vu+ RCU is a universal RCU that can be used for TV and STB at the same time.
A. User Guide of Vu+ Universal RCU
Pre-note
<< >> means long press
< > means normal press
4 digit code can be found in the TV brand code list of the user manual.
The new RCU of Vu+ is a universal type and you can control your Vu+ STB and TV at the same time. This
universal RCU is a modeless design. While offering the basic control functions of your TV (TV Power,
Volume +/-, Mute, AV), you can control STB without having to select mode between TV and STB every
time. Compared to those universal RCU of mode selection types, the modeless universal RCU of Vu+ is
clearly a smarter choice by eliminating unneeded control functions.
1. TV setting
Set-up Sequence: <<1 + 3>>, <4digit brand-code>, <<Mute or Power>>
1. Press number 1and 3 for three seconds until LED is on.
2. Find your TV brand-code from the TV code list and insert 4 digit code.
- If you press “0000”, Full Automatic Scan will start. This will take a while.
3. Keep Mute button (or Power) pressed until your TV is muted (or turned off).
4. If your TV is muted (or turned off), stop pressing Mute button.
5. Now, your RCU is in test mode and press Volume + /- to check if your TV responds.
6. If the volume buttons are operational, Press <OK + STOP ( )> to escape from the set-up mode.
2. AV setting
AV button is for the selection of TV video source. AV button may be automatically set up depending on TV
models. In case it is not automatically configured, please follow the instructions below.
Set-up Sequence
<<1 + 9>>, <<AV>>
1. Press 1 and 9 for three seconds until LED is turned on.
2. Keep AV button pressed until your TV responds and displays the video input source.
3. If AV button is working, check if AV button is properly working several times.
4. Press <OK + STOP ( )> to escape from the set-up mode.
3. RCU Buttons for TV
* Buttons for TV only: TV Power. AV
* Buttons switchable between TV and STB: Volume +/ - and Mute
- These buttons are for STB only before the RCU set-up is done.
- It is switchable only after the configuration is done.
* All the other buttons are for STB only
4. Mode Switch of Volume + / - and Mute
For the sake of easy volume control, please set the STB volume at 50% of the maximum level and set
this level as the default volume level from STB. Then, you just have to control your TV volume only without
having to adjust STB volume at the same time.
Set-up Sequence:
<<1 + 6>>, <9>, <9>, <3>, <TV Power or STB Power>
73
Vu User Manual
+
1. Press 1and 6 for three seconds until LED is on.
2. Press <9>, <9>, <3>.
3. If you want to control of TV volume, press TV Power button. If you want to control STB volume, press
STB Power button.
5. Reset of TV Set-up
In case you want to reset the configured TV set-up of your RCU,
Press Sequence:
<<1 + 6>>, <9>, <9>, <6>
1. Press 1and 6 for three seconds until LED is on.
2. Press <9>, <9>, <6>.
3. This will reverse the RCU into no configuration state.
6. System Code Change.
You can change the system code of your Vu+ universal RCU according to the Vu+ model that you want to
control. The default system code is Mode 2.
Mode 1 : SOLO / DUO
Mode 2 : UNO / Ultimo
(*Note : The keyboard of Ultimo remote cannot be used for SOLO,DUO & UNO.)
Mode 3 & 4 : reserved for future models.
Press
<<2 + 7>>, <HELP>, <0001 or 0002 or 0003 or 0004>
1. Press 2 and 7 for three seconds until LED is on.
2. Press HELP
3. Press <0001 or 0002 or 0003 or 0004>
DISCLAIMER
Vu+ universal remote controller (RCU) is developed with Philips Electronics. The database used in the Vu+
RCU supports more than 90% of the TV brands available on market. This means that your TV may not be
compatible with this universal RCU in some rare cases. In this case, Vu+ RCU can be used only for Vu+
set top box.

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nothing is connected to my samsung smart tv, only the vu+ultimo

Wrong buddy,,, wherever you are getting your server from these days is connected to it also ....
Apart from that - there might be an audio option of what was known as " hotel mode"
meaning the likes of tv ads are Highlighted ,etc.. so check your tv settings..

I agree with cazuela, you've got a demo mode setup on your tv. I had that problem when they came to change a hdmi port on my tv and the automatic seeing for the tv was demo mode and it kept on coming with the 4k demo that was built in.

Doesn't even need to be connected to the Internet for the demo mode to come on, it's set to come on after a certain period of time.

Deffinately what's causing the problem here

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