I think there is also an memory leak:
- First the raspi is recording “logo / SD” from 7:50 to 8:05 a clock
- then “tagesschau / HD” (from an other station) from 8:00 to 8:20
- playing short the jerking “logo”
- playing “tagesschau” (without jerking) / also recording an other SD-Video (not from kika)
- near the end of “tagesschau” (15 minutes) the raspi slow down and the memory is 100% in use
- reboot: everything is normal