Hi. New to the Forum. I have been using a tune in a 99 vette with A4 and Yank SY3500 for sometime with no problems. Recently purchased EFILive and made a few re-flashes to change LTFTs and timing (no changes in the trans/TCC area) and now the TCC has begun intermittently unlocking in 3rd and 4th gear well above set disengage speeds. Happens under steady state, light load, or coasting conditions. P1870 is still set to not report, or set codes, and no codes are set when the TCC unlocks. I stumbled across an interesting thing…when PCM is shown on the DIC with no codes, if I hold down reset it relocks the TCC. Have been chasing this thing for a while with no luck. Frustrated. Any help or suggestions will be greatly appreciated. Can’t understand why it started unlocking after a few re-flashes, and don’t understand why “reset” relocks it when no codes are showing (no history codes ether).