Top Ten Reasons Robot Loses Com in a collision ?

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Just wondering if anyone can contribution ideas as to possible causes to our robot occasionally losing com in collisions on the field. At this point of time I am not aware that the CRio had rebooted as a result but will try to confirm.

This is what we have looked at.
Bridge power jack contact looks solid. (will hot glue it in anyway)
Good soldered connections from bridge to converter
Converter to 12v plug in power distribution board looks solid
Crio power power plug, Crio power plug in power distribution board.
Network cable contacts at Crio and bridge ? Any risks there ?
Terminal lugs in main power distribution board possibly coming loose (main circuit breaker lugs, power distribution lugs)
Loosening contacts on battery terminals

Any other suggestions or recommended good practises that may not be obvious ?

Anyone know how good the regulation is for the 12 and 24 volt outputs on the pdb ? How low can the battery go before the CRio or Bridge is at risk ?