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Given your probable mileage from your stated usage, 54,600 kms or 33,900 miles, your valves and, or your valve seats in the cylinder head may be worn out. It could also be a problem with the lock nuts on the valve lash adjusters being unable to hold their torque due to worn threads.
If it were my bike, I would do an adjustment myself. Use a torque marker on the nuts to see if they move. If it doesn't hold and the nuts have moved, I would readjust and install new lock nuts. If it still doesn't hold and the lock nuts are staying tight, then I would look into replacing the cylinder head. Last time I looked they were going for US $150 shipped on AliExpress, probably cheaper to your location.
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