Deere 930m blades disengage??

Dirt Diver

LawnSite Senior Member
Z930m 345 hours.
Every 10 minutes or so, the blades disengage. Out of about 15 times today, the engine only killed twice, the rest of the time it was just the blades.
The wrench symbol blinks once, pauses, then blinks three times.
1-3, 1-3, 1-3.This continues to repeat until I turn the PTO off. When I turn it back on, the blades immediately engage. I wondered if it could be a safety switch, but it doesn’t necessarily happen on bumps...smooth areas too. Plus, wouldn’t the seat sensor kill the engine every time too? Is that blink pattern indicative of anything specific?