Presuming it is plugged into a socket that is on a 15amp breaker which would trip before the protector gets overloaded and catches fire! There might be other things on the same breaker causing it to trip. There should be an amp rating for your SP somewhere on it.
Well i have two oulets on one wall. on one outlet i have a belkin surge protector and on the other outlet about 6 feet to the right i have another surge protector with my tv, DVR, ps3 and chargers and light plugged in. Maybe if these two outlets are on the same breaker could be causeing a problem when both are on?