I was having some problems with Hard Disk Not Found display and upon upening up the unit found one pin with a solder problem. Fixed that one....problem occured again..opened up the unit and upon poking and prying fount that most of the pis were able to be pulled away from the motherboard.....will have to resolder all of them

seems to me that this is a 'time' problem and that many units are experienceing this at the same time and that as the unit ages the soldering just weakens.....