The apps has recently started to unlink itself from eBay. I have relinked a few times and it will intermittently unlink.

I've missed a few snipes this way.

This has been raised a few times now, I'm afraid this a system problem not user error.

The sniper does not unlink on its own, it does not have such functionality.
If you think your account is out of sync, please do "Refresh" on the Main screen to refresh your account's information.

You did not provide the item numbers so I have no way to check or investigate your concern.
If you don't want to share it, let me know what you saw in the status of your snipes.