Issue happens in specific situation:
First card tune failed and previous channel tune on first card has failed too

In that case MP recive cardchange event from server and starts playing from beginnig, but tswriter continue writing to previous buffer(because card on server side did not change and same tsfiles set used)

h4. Steps to Reproduce
You have to own 2 tvcards
map some channels to every card
Do something to prevent correct tuning on first card(for example set CAM to false and use scrambled channels)
start playing channel
Zap to next channel
Playing starts from the beginning of timeshift buffer