I'd suggest that is power supply related and may be something as simple as a loose fuse, but of course that is the optimist talking; check fuse #1 10A & #22 7.5A in the under dash fusebox are properly seated. It's probably a loose connection somewhere that causes the reset.
The gauge control module will produce a fault code in the range B1150 to B1188 which indicates which of it's connections has been lost, this should be stored and can be read by the garage or someone with an OBDII code reader. You can also follow a self-test procedure as shown here:
http://www.hondafitjazz.com/manual3/en/html_en/000000000000313.html# Push and hold the SELECT/RESET switch button.
# Turn the combination light switch ON.
# Turn the ignition switch to ON (II).
# Within 2−5 sec., turn the combination light switch OFF, then ON and OFF again.
# Within 5 sec., release the SELECT/RESET switch button, and then push and release the button three times repeatedly.
Hopefully you don't need 3 hands although I'd assume it will pass without fault when tested manually, but there may be a fault code stored from your earlier problem.
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TG