I've owned my TAF for a long while without having this ussue, have an offboard battery holder, and use high-quality batteries in it. I also make a point to change them on a regular basis (every year or two). The point being, I shouldn't be having this problem. A few months back I got the dreaded factory reset message when I turned the game on. Chalked it up to weak batteries, replaced them (they were still good), and reconfigured the game settings. So far so good. Today I had that happen again. Full disclosure, I haven't been playing it alot lately. These batteries are nearly new. Any restrictions on what batteries to use? These are Energizer Ultimate Lithium. I have a spare offboard battery holder that I will also try. Any ideas on what else I should check/test? Thanks in advance.

Turned out that the battery extender had a frayed wire that provided an intermittent connection.
I fixed that weak connection on the extender and it works just fine now. Thanks!