My opinion: PTAT has never been reliable and often interferes with regular timers. That is why I have it turned off (mostly) and set regular timers for everything I want recorded.
The reason I say "mostly" is that if you turn PTAT totally off, you lose auto-hop. Therefore, I have PTAT enabled only for one channel, one day a week, save for 2 days (the minimum). That one day/channel is one on which I don't have any regular timers set.
That strategy has been working perfectly for me.
______________________
Hopper 3 and four Joey-2s