Hey folks, I had started a thread on the UT01 problem before I found this one. That thread is here:
Take a look at post #18 where ‘so far’ I have found a simple fix that is working. I can’t attest to it being a long term solution yet as I’ll have to use/carry it for a while. But I offer it here in case it helps someone else. It may or may not be the fix for your light, but maybe it will turn someone’s frown upside down 
