PS3 beeping thrice issues

[Windows10User2]

The PS3 beeps thrice and restarts when exiting IRISMAN using the PS button after uploading files from the PC to the PS3 with FileZilla Client and with an USB device connected to the PS3;

The PS3 often freezes when returning to XMB from IRISMAN using the Circle button after uploading files from the PC to the PS3 with FileZilla Client and with an USB device connected to the PS3, and when clicking the PS3's power button, the PS3 beeps thrice and turns off;

Sometimes, the PS3 also beeps thrice and restarts after exiting a game or app using the PS button with an USB device connected to the PS3;

There are times when the PS3 beeps thrice and restarts in other occasions as well.

EDIT: If I close FileZilla Client after uploading files from the PC to the PS3 or if I don't connect an USB device to the PS3 before uploading them (or if I take it after uploading them), I can exit IRISMAN using the PS button without the PS3 beeping thrice and restarting and I can return to XMB from IRISMAN using the Circle button without the PS3 beeping thrice and turning off.