Recently my LRP Spin Pro / Thunder Power Z3R 6.5T combo has started to shut down, seeming in random fashion.

Sometimes the ESC completely turns itself off. Sometimes the ESC will just flash red, or yellow until power is removed. The problem seems aggravated by cogging at low speeds when accelerating hard. The problem is also especially bad during the first several laps

Any ideas what could be going on?

Since you said there is cogging involved, have you tried a different sensor cable followed by a different motor?

Here is the link for the manual, you might find info you need regarding lights.

https://www.lrp.cc/fileadmin/lrp_anl...e-121127fv.pdf

And here is there phone number just in case. 949-276-6060