Lazy horizon

[n14sr]

D-100 and D-120 updated to latest. Horizon line slopped 10 or so degress left and not normal until 10 minutes into flight. Had the same problem before the last update but it didn't seem to be as bad. What could some causes for this be? Thanks for your help. I really enjoy my Dynons.
Ron RV-7A 235 Hrs.

 

[dynonsupport]

The EFIS does have the ability to sort of self calibrate over the long-term, and this usually helps the attitude stay accurate, not less. In rare cases (usually when people are bench-testing/playing), this "correction" can accumulate, which would lead to some temporary behavior like you're seeing. If it happened once and cleared itself up for good in that one flight, then things are working well. If it's recurring, we should probably take a look at your unit. Give us a call at 425-402-0433 for more help if that's the case.