We got 1880 grand piano, we removed all strings and after 3 months we put them back. From then i tuned my piano 0n 430 Hz 4 times, and after week it needs to be tuned again….Is it normal?
Contrary to the person who posted above, old pianos do not deteriorate with age if they are kept in good condition.
You don’t specify whether you used the old strings again or new strings. In either case the piano needs time to settle in. It has thousands of moving parts and being largely wood, it takes time for them to adjust.
The other thing that could be wrong is that your tuning pegs are loose. If they’re only a little loose, some violin peg dope might help, or tapping them in lightly might help too. Please don’t do anything without having a professional tuner look at it.