Oscam losing reader maybe?

I have a problem with some cards sometimes¡¡¡
I use raspberry pi 2 running osmc with usb powered hub and some generic cardreaders.(Oscam version r11200)
The cards in question is a nagra card from HD+ caid 1830.
My satbox client stop opening channels sometimes and the only way to fix this is stopping and restarting reader manually.Then it works a again till no body knows.
The same happens but no so often with viaccess card Tntsat caid 0500.
Conax or criptowork cards no problem.
I hope someone can help me coz my receiver has only 1 card slot and is annoying to change cards everytime i want to see a certain channel and the Pi 2 and oscam is my best solution.
Again is very unpredictable when this thing would happen¡¡¡
Thanks in advanced¡¡¡¡

Thanks for the reply mate¡
You see the same card i used before in an enigma2 sat-receiver also without probs.
I think is more like pcsc problem in oscam.
Can i run sbox on oscam also?

Ok thanks¡
It has not happened again yet.
I think the last change i did was this in oscam.conf:

readerrestartseconds = 10
fallbacktimeout = 2600

Do'nt know if that fixed it?

I'll post the log if it starts playing up again.