Reset activates at certain point

Hi. My m1000 was milling thing, and on second same detail it stoped. And at that point in Y axis it started to activate reset button. Whe i home all, and go down on Y at coordinates 940 it activates. When i use override limits ig continues. i can use full range, no problem. When i go backm on 709 it spo again, i can skip with same way, But if i use home all, motor starts to struggle and right motor goes further, In manual, again all is ok, in override linits. I took Y apart, cleaned, olso cleaned triggers, reinstalled program, but all keeps same. Can someon help me pleas. Thanks.