ADL keeps restarting + damping question

I can be driving along and everything seems to be fine, but at apparently random intervals the ADL will go through the start cycle again.
Any ideas as to what would trigger that?
Also, the fuel reading is pretty erratic, I had a bit of a read of this forum and saw that I should increase the filtering value. It's currently set to 250 ms, can I go to something like 5,000 ms? I just need it damped a fair bit to smooth out the movement of the float.
A similar thing for the speedo reading, it wobbles around a bit, would something like 500 ms be better?
Any ideas as to what would trigger that?
Also, the fuel reading is pretty erratic, I had a bit of a read of this forum and saw that I should increase the filtering value. It's currently set to 250 ms, can I go to something like 5,000 ms? I just need it damped a fair bit to smooth out the movement of the float.
A similar thing for the speedo reading, it wobbles around a bit, would something like 500 ms be better?