Engine stalls while plowing

I know there are other posts on this sight about 570s stalling for no apparent reason, in fact my wifes 2015 has that issue. My 2016 has never had this problem…until now that it’s winter and use it for plowing. It starts and runs fine for the first 5 minutes or so but then suddenly quits – everytime just after I come to a stop and put in reverse. When I try to restart it won’t even turn over, acting like the battery is dead. I’ll try again in a few seconds and it’ll restart with no problem. It’s only ever done it once in each of 3 plowing session. Any ideas?