I'm really confused now.. I have 6x TSDZ2 motors.. 52v battery's.. all running opensource firmware [fantastically].. I had one fail.. replaced 52v controller.. now it powers up every time I connect battery.. when I turn it off.. the screen read "off".. permanently and wont turn back on??.. I then remove the battery and repeat the cycle.. so I replaced the controller again.. as well as the screen.. and speed sensor.. same issue?.. any advice please?..