problem with my quark 80b

[BrianG]

When something starts acting up with no apparent cause (like heat, smoke, etc), I like to check connectors and wiring. Over time, connectors can get dirty which won't work as well. Also, wires may have broken strands from the constant motion or unplugging/replugging. But first, you might want to try another battery - the one you are using may be getting tired.