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based on the symptoms, it seems that the issue is with the radio module and not with MK2.
again, going off your description, it feels as if the electromechanical connections inside the radio (soldered points) may have deterioted to the point, where external forces (bump on the road) will make or break electrical connection, or the environmental influence (heated dash) will expand the connection to make proper electrical circuit.
The unit needs to be either replaced or repaired. Was the unit water damaged? Does E46 keep the radio unit in the trunk as the E53 does? if so, check for water damage. also, the radio itself should have its own fuse located on the body of the radio module - not that it matters in this particular situation, as the radio is working sometimes anyways, but just in case if you need it for future reference...
there is guy somewhere in UK who fixes these radios and upgrades their firmware, i just was asking him a question very recently... i will find his info and post it for you...
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