Steps to reproduce:
1) Create a timer to record the current event (I use "Single EPG" -> Add timer...)
(recording starts immediately as current event is in progress...)
2) Menu -> Timers -> Timers -> Delete timer created in step 1
(recording will stop...)
After this sequence the following can be observed:
Menu -> Standby and restart -> "Deep standby" will report that "Recordings are in progress or about to start..."
Any power timer with an action of "Deep standby" will fail to put the box in deep standby