A lesser risk is to remove the aerial. There is still a risk of damage but far less so. When this works it takes less than a minute to regain control.
Should the aerial output of the 9200T be connected to other PVRs/TVs/STBs then make sure they are switched off when you disconect the aerial and when you connect it again.
To reduce the frequency of freezing make sure that the software is the latest version (1.00.23).
NS
April 2011