PS100 volume increased ocassionally?

Hi all,
I’m here to give a feedback about PS100. I have purchased a PS-100 around 2023.11. Sometimes(very few time actually) when in use (with jp2c/mark v, I only got these) after some time, the volume would suddenly increased , like it has turned into bypass mode. And after restarting, it could be back to normal.
the issue did exists but happen very few times, that I almost forgot about it. I remember it now is because I have just bought a PS2A few days ago, and I found the volume in PS2A is louder than PS100 when in same position(like 8 or 9 o’clock) , and it make me wonder whether there is some potential problem in my PS100?
Oh, and I remember one more thing, but I’m not sure if related to the PS100. it’s that when I used my old mark v 90w with PS100, the sound would die out and became very weak and distortion after 30-60min, but when I use mark v alone, it wouldn’t happen. It just began at around 2025 summer, never happen before.