My 02 Ultra Classic will loss all electrical power and shut down with no warning. I have changed out 40 amp main breaker, replaced the systems relay switch, cleaned battery cables. The clock and radio stations don't have to be reset they keep there memory. I stop turn my ignition off then back on and this usually restores the power to the bike, bike at first runs a little ruff but will straighten out in a few minutes. Any ideas what to check?