NC+ card in a USB WB Electronics Infinity Unlimited

I have this card working in oscam in the above reader for over two years now without any problems.
Two days ago card started not clearing any channels. In order for the card to start clearing channels I need to restart oscam. Then, card works for a couple of minutes to hours and then stops again responding.

Is this anti card sharing measures or there is something more? Entitlements of card are

Type Caid Provid ID Class Start Date Expire Date Name
admin0100 000000 xxxxxxxxxxxxxxxx 00000000 1970-01-01 2016-05-12 CYFRA +
PBM 0100 000068 xxxxxxxxxxxxxxxx 00000000 1970-01-01 2016-05-14 CYFRA+ 1
PBM 0100 000065 xxxxxxxxxxxxxxxx 00000000 1970-01-01 1992-01-01 CYFRA+ 2
This is my config

oscam.server

[reader]
label = local_card_reader
description = Cyfra Local Card
protocol = mouse
device = /dev/USBReader
services = !cyfra_local_card
caid = 0100
ecmwhitelist = 64
detect = cd
ident = 0100:000000,000068
group = 1
emmcache = 2,2,11,1
blockemm-unknown = 1
lb_weight = 300
cccreshare = 1

Any help will be really appreciated.

I just want to let you know guys that I have found the problem. One of my peers was making bad requests to my card producing unsubscribed 93 02. After a few requests the card was blocked and a restart was needed