Gen-9 iPad Model#MK2K3LL/A running v.15.5, keyboard tap feedback sounds randomly starts and stops

I haven’t changed any volume or system settings really since initially setting up the device, but every so often, most likely to happen for whatever reasons around about 9-11pm, the keyboard feedback tap sounds that I was accustomed to previously and quite enjoy as a defining feature of apple handhelds and tablet computers, much the same as the OG strum ringtone.. you can’t miss it, they start working for a short amount of keystrokes or time I don’t know.. just a matter of seconds though, between 5 and 15 perhaps 30 seconds tops. They randomly start and then immediately cuts off again. This happens about once every day to every 3 days, maybe longer in between on a good half of the duration I’ve owned the iPad.

Device = Gen-9 iPad

Model = MK2K3LL/A

Version = 15.5 (19F77)

Issue = System sounds

True :

• Side volume keys control ringer volume
• Volume set to max ringer
• No accessories are in use (ie. physical keyboard, Bluetooth, headphones)
• All apps are forced closed from double click home button and swiping each window off the top of screen
• Typically using Safari but other apps have produced the tap sounds before
• Speakers work during video and audio playback (ie. YouTube, Pandora)
• No special accessibility settings in use
• 99% portrait style orientation
• Standard issue sounds, ringtones, keyboard themes, keyboard layout is US English QWERTY, no other keyboards added (ie. Emoji)
• Low battery mode is OFF
• Settings > Sounds > Keyboard Clicks is Green/ON
• Settings > Sounds > Lock Sound is Green/ON
• Settings > Sounds > Change with Buttons is Green/ON - The volume of the ringer and alerts can be adjusted using the volume buttons
• System software is updated and current, storage space is 75% full on device, no background apps are stealing the focus or eating up available processing power, has been recently restarted from dead battery to full charge, but battery doesn’t appear to be a factor

Please help, there is no toggle switch on Gen9 only the right side top from portrait being the physical volume keys, which both work fine, when used they give the feedback visually that volume for ringer is 100% with the floating volume indicator pop up, and there is the top side far right lock button which is clicked and causing the screen to darken to black and awakens the device if pressed again bringing about the password entry screen, working perfectly, both physically with buttons, and with touch screen accuracy and keyboard use is always tap or swipe down for shift alt characters, no swiping multiple keys for typing entire words.

Thanks