I have 37 feet running on an rgb strip light and the miboxer teat for 24 volts when it is not on full brightness but as soon as I max out the brightness the the voltage fluctuates from 24v up to 40v and the light flickers and dims back down automatically. Anyone come across the problem before?
Length of the LED strip does not tell us what is the current/power requirement and you haven’t told us the capacity of the PSU you are using. Check those values. Most likely your PSU does not have enough capacity or it is faulty.
You are expert, that’s right. Main problem is PSU.