Read your owners manual!
You are winching for to long!
Warm winches are built to only which about 30-45 sec at the time. Over winching creates excessive heat, and heat creates added resistance in the electrical system. Your battery/charging system is also being over worked. Watch your battery meter close. 30 sec of winching takes roughly 2-3 min for the average vehicle to recover the battery amperage.
Be mindful of your alternator wire as well. Most are below the standard for the peak amp out put from the alternator. The mfg assumes the peak will only be reached in surges, so they gauge the wire for the average out put.
My xd9000i has a peak draw of 400amps. I have a 150amp alternator. A battery can only accept a set amount of amperage per min. My battery can only take about 100amps per min, so if I use the rule of thumb that the which always operates at a minimum of 50% draw even under no load. Thats 200amps per 30 sec of winching. 200amps takes roughly 2 min of charging to recover the battery.
Do I always obey the rule, NO, but my battery/alternator/wiring have all been beefed up to sustain higher amperage. I have a second battery with substantially higher rating too.