Sounds like the "system" started to pull too much current and began to heat up. After a bit of time the fuse finally blew and protected what was left. Then you bypassed the fuse and this allowed virtually unlimited current through the RX until it fried. The RX may have a built-in ESC for the motors and when one went bad is sucked too hard on the battery. Eventually it found the weak spot in the design and the RX gave up. Time for more money now.[:@] Sorry