By chance, have you not updated your SkyView firmware since last April or May 2019? Dynon issued a firmware update to correct the big GPS clock update that usually created errors similar to a left quartering tailwind (regardless of the actual winds).
Not quite what you had, but I know the experienced errors varied.
Sid "Scroll" Mayeux, Col, USAF (ret)
52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
"KELLI GIRL" N260KM RV-7A tipper
Catch her on YouTube's "Because I Fly!" channel
Proud and grateful 2020 -=VAF=- Contributor
Last edited by scrollF4 : 02-02-2020 at 07:19 PM.