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Yamaha SK-20, longer time for the sound to turn on

Hello, friends!
I have an old Yamaha SK20 synthesizer. Whenever I turn it on, it doesn't work at first. Only when I press several keys at once and switch between waveforms, at some point the sound appears, and then it remains stable. The problem is that when turned on, it takes a longer time for the sound to turn on each time.
Can I just leave the synthesizer on all the time?) Perhaps turning it on and off each time can cause additional breakdowns in such an old instrument? Or could it be dangerous for a long time as well?