There were a few days where a problem connected with freesat server reconfiguration cause random reboots. No problems during the last few days.
By default units will power down into standby after 3 hours of no remote activity.
Freezing is not normal, is your signal quality OK on your usualy channels and the EPG fully populated?
If your units problem continue, place in standby and then disconnect power for at least 5 mins after the power supply LED goes out.
If that does not solve the problem make a note of your schedule (a Photo is quick) and reset to default. You recordings will be saved.