Have you tried a hard reset?
Disconnect from mains and back-up battery. Check and clean the entire track, gear and wheels. Reconnect mains and battery.
The "overclocking" may explain why my one premature light bulb failure was on a road trip, where the bulbs were on for an extended period of time. Best to carry spare bulbs on a road trip, cos I learnt that the non standard bulbs not stocked by the smaller shops.