Boss BR 80 with a startup problem

I have a Boss BR 80 8-track recorder with a problem. A microrecorder to be precise. This device has an on/off button, which is of course intended to start the recorder as soon as you press the button for a while. However, the button has a few other functions, such as switching between MTR mode, E-band mode and Live rec mode with a short press each time. The problem I have now with this recorder: when I press the power button and still hold it down, the thing starts up, but everything stops as soon as I release the button. I would like to ask if you know why this happened? And could this be something that can be repaired?
Hopefully you can comment on this?

I’m having power up issues with a Boss ME80 effects processor. I bought the switch & had it replaced by a local circuit shop. It wasn’t the switch in my case. I got on here hoping I could get an idea of what to check next. I love this pedal board & everything about how user friendly it is.
I’ll keep a check here just in case there’s a reply on a fix for your situation.