All in One inverted mounting roll error

I have mounted my all in One board up side down to the bottom of a lid in the cab. I have the roll offset to 180deg. The roll will read in the -5 to 5 deg range then randomly switch to -355 to 5 deg, this causes some very unpredictable steering. When the board is right way up and roll offset of 0 it works fine.
Ver 5.7.2, single antenna, bno085.
Has anyone come across this before?

I ran our combine that way for awhile. It steered ok even when showing 355deg off. It seemed only a display error.

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The bno doesn’t show real heading, when it powers up it starts at 0. AoG just uses it for heading change.