Hi, thanks for your question. Its not a a safety issue as that unit has safety sensors inside to prevent any problem like that.
But... the fact that it sounds so bad, like grinding gears when there are no gears in this one means you need new drum rollers and if you continue to use it like that you will likley burn out the motor.
This one really does need a service call to fix this unless you are handy and have the tools for this task. If so , I will help you all the way with this repair. I would have the rollers replaced as well as the belt and a good clean out so all will be good for a few more years with trouble free operation;-)
In any case, I will stick with you until this is complete.
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Thank you and have a great day!