I often happens when I use any tsreader since the dynamic pins feature was introduced.

both happens on singleseat and multiseat.

usually happens when I change channel from one dvb card to another.
The 2 channels have different audio video specs.

luckily mp does not lock up when this happens, instead it just stops playback ... it will do so on any channel. meaning, I cant tune into any channel now.
only a restart of mP sorts it out.

check out the logs.