Quad Freaking Out During Flips and Rolls

Okay, I’m dropping this here in hopes that someone has seen this before. Yesterday I smoked a brand new QQ190 Tank frame on its first flight since the rebuild.

While doing flips or rolls where my copter will stop sending stick commands to the copter and lock into a high-speed.  From what I have been able to determine this only happens if I perform a flip or a barrel roll. I have been able to fly race style with fast acceleration and hard turns, but once I go inverted all hell breaks loose.

This (was) my QQ190 Tank. I was not flying video yesterday when it happened for the last time, but this is identical. VIDEO

This has happened during my last two flight sessions. The first time this occurred I added a new profile of slightly adjusted PIDs/Rates–after making sure the profile was stable in horizontal flight I tried acro flying and my first 360º roll never ended. The crash was light so I dusted things off and went back to my original profile and continued to fly. Back on my default profile things appeared normal until it happened again this time there was frame damage and we were done.

I rebuilt the copter(steps below) and on my first battery after shaking things out she went down again in the exact same way.

To be clear flips and rolls will cause the craft to spin out of control on the roll axis.

Trouble Shooting:

Checked all hardware for physical damage. All wiring was meter tested for common, +volts, shorts, opens. ESCs were bench checked and calibrated all checked out. FC was wiped and reprogrammed from scratch with the latest stable TBS build and PIDs were left stock. I purchased a QQ190 Tank V2 base and reinstalled everything and checked everything again.

During the freakout, my VTX, camera, LEDs still have power and are functioning and my RX is accepting disarm and failsafe commands.

Unfortunately, the build does not have a black box so the video above is all I have.

SPECS:

• Frame: QQ190 (Tank)
• FC/PDB/VTX: TBS Powercube Elite Colibri RACE v2
• ESC 20A Favourite Little Bee
• RunCam Swift Mini
• Lumenier SKITZO 2500KV
• BetaFlight (Current TBS stable build)
• Flight mode: Acro Airmode (only)