I posted here a while back about the dashboard rebooting whilst starting.
The gauges all go to maximum, then minimum, and then read correctly.
Sometimes the trip meter resets to zero.

My '99 LX started doing it about 18 months ago. At first it was only in cold
weather, and during the first start of the day. It gradually got worse
until it happened at every start.

With help from Tim... I checked and cleaned the main connections to both
fuse boxes and the main earths. The fault persisted.

It was clearly a voltage drop problem; the battery was the original and cold
cranking was getting quite slow. The battery voltage after the car had
stood overnight was 12.4.

I replaced the battery just over a week ago, and so far the reboots have
gone.

Hope this may help someone else.

Chris