I used my plow this morning-no problem. went home put in all new bolts "lift arm,top-bottom pump"etc. drive to carwash,on the way my plow starts dropping slowly. if left up for 45sec. it will be on the ground.I've NEVER had this kind of problem. can someone tell me what's going on please?I know you guys are going to tear me a new one,but it came with the truck. It's a meyers E-47! IF YOU CAN LOOK PAST THAT FACT PLEASE help me!!!! I'm lost