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Ground Fault on UMC?

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I've been charging on a newly installed 50amp service with the UMC for two months but last night went outside and it was flashing red once which means ground fault detected. I had my service installed by a professional and inspected by the city all done on the up and up. i flipped the breaker on/off and it went away....so far but it's only been 12 hours.

Should i worry about this or just let it go to see if it happens again?
 
Was your UMC outside? Did it get wet from snow or rain? I killed my UMC by leaving it out in the rain. Same error (ground fault). The UMCs are not repairable. Tesla offers no repair options and opening up mine and trying to fix it were not successful either. I had to buy a new one.