About 5 months ago I bought a trijicon acog from midway USA (TA31 model) worked fine when I got it, I took it to the range twice, the second time I noticed the green chevron wasn’t lighting up but the bottom half of the BDC was lit up, about an hour or so later all I could see was just the etched reticle, nothing worked, called trijicon, I sent it in for repairs a few days ago but haven’t heard anything back, has anyone encountered this issue before? And if so what was the cause or issue?.