There are a few flavours of the 910 signified by letters after the '910'. This one has the power port in the plastic housing under the seat.
https://www.manualslib.com/manual/800818/Diamondback-910ic.html?page=13#manual
Ask them
Diamondback Fitness ? 6004 South 190th Street, Suite 101 ? Kent, Washington 98032
? Ph. 1.800.776.7642
? Fax: 1.800.776.2073
..
It could just be that the game could be having issues then and the disc for your PS 2 console could be faulty and corrupted. I would try to buy another disc of the game that you have and see if the problems goes away.
There is a small battery inside the JVC rx5050 that helps keep the sound settings in place. If this battery starts to die, it can cause the sound to reset to zero. To fix this, you'll need to replace the battery with a new one.
heres your manual just need to do a search ---battery is a 12v non servicable sealed inside the unit you have a port in witch an auto 12v plug or a 120v to 12v adapter can be plugged in https://www.manualslib.com/manual/975935/Stanley-Sl1m09.html?page=3#
It could be the controller is not working anymore and you need a new controller or the controller needs to be resync again and there is also a connection issue too.