Pause/Rewind works perfect for me normally but there is one scenario where it doesn't.

1. Play a program that was recorded earlier.
2. While watching the program, hit "Guide"
3. Select a live program - this causes the recorded program to stop playing and live TV to play

After #3, timeshift is not working. Pause/Rewind of live TV does not work.
If I change channels, Pause/Rewind works as expected.

My TimeShift setting are:
- start Timeshift are 2 seconds.
- save Time shift to hdd (internal 512GB SSD)