It depends. It could be the machine heads, it could be an improperly adjusted tremolo system. Another thing it could be is that the strings are expanding as the guitar is played. One of these probably
To intonate a Stratocaster guitar for optimal performance, adjust the length of the strings using the saddle screws on the bridge to ensure each string is in tune with the corresponding fretted note at the 12th fret.
The best answer for this is: Get a tune-up.
Sometimes. It depends on what is causing the knocking.
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if it had a recent tune up then do an oil change. if not clean your air filter. it needs a tune up..
Could be time for a tune up.
Your guitar may keep going out of tune due to factors such as changes in temperature and humidity, poor quality tuning pegs, old or worn-out strings, or improper string winding. Regular maintenance and tuning can help keep your guitar in tune.
the message
Time for a tune up.
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bad idle, bad timing, needs tune up , etc.
Time for a tune up.