T-Motor MN2806 KV650 with Arducopter 4.2.x

4.3.4, I got a potential thrust loss message again (91 01-01-1980 08-00-00.bin). wonder what is the cause.

11652 0001-01-01 00:01:02.135 MSG 62135122 CAN[124] exceptions : 72 free
46724 0001-01-01 00:02:02.136 MSG 122136702 CAN[124] lpwork_thread : 612 free
46725 0001-01-01 00:02:02.136 MSG 122136907 CAN[124] idle : 80 free
46726 0001-01-01 00:02:02.137 MSG 122137096 CAN[124] i2c2_thread : 72 free
46727 0001-01-01 00:02:02.137 MSG 122137477 CAN[124] spi3_thread : 80 free
46728 0001-01-01 00:02:02.138 MSG 122138020 CAN[124] can_thread : 80 free
46761 0001-01-01 00:02:02.139 MSG 122139965 CAN[124] exceptions : 72 free
50467 0001-01-01 00:02:08.611 MSG 128611373 Potential Thrust Loss (3)

You plotted the RC outputs right? What conclusion did you reach when you looked at it?