if it’s really high, then probably it’s hard or software related. But you could also verify interference and overlap between the two cells. Just to ensure those are not a problem.
You can dot that with drivetest. This drivetest can also give you good indication on what’ going on. You could also check the reselection. If that doesn’t work, then it’s clearly not “normal” 🙂
If it’s software, you could try to delete the adjacency in the OMC-R, and recreate it. You could even try to delete the two cells, recreate them and recreate the adjacency.
If it’s hardware, then synchronization is a possible problem –> check the SUM card
Does it happen with only one neighbor or all neighbors ? In one direction or in both direction ?