Sony TA-VE150, When i turn on the amp i am getting some sort of feet back to the speakers just like a poping sound then the amp goes into Protect mode and i have to unplug all wires to make it work again, All 5 power transistors were all dry jointed so i cleaned them all and added new compound and the amp work fine this morning but when i turned it on tonight i had this fault, Can anyone help with this please