Please tell me that your “half an hour on average” is a gross exaggeration. NPP 7.5.6 was released Mar 19; NPP 7.5.5 was released Feb 27, and NPP 7.5.4 was released on Jan 1. This year, there have only been three NPP updates, averaging about one every two months: that’s not bad. If you’re really complaining about one update every two months, then you might want to just turn off auto-updates (Settings > Preferences > MISC, uncheck ☐ Enable Notepad++ auto-updater) – though you’ll then want to manually watch for updates on the website.
Assuming it’s really “every half an hour”: My first guesses are that 1) it’s one of your plugins, or 2) that somehow the update sequence of NPP keeps getting interrupted or is not allowed to finish, so it’s the same update trying to repeatedly update itself. #2 doesn’t seem likely (I’ve never heard of it happening)… though maybe if you tried to do a full install, and don’t have Admin privileges (or if your admins revoked your local-Admin privileges on your PC due to a policy change), then the update process may be corrupted.
My more nefarious guess #3: where exactly did you download your copy of NPP? If it’s truly NPP (and not a plugin) that’s trying to update, then I am afraid you may have downloaded from a less-than-reputable location, rather than from https://notepad-plus-plus.org/download/, and bad things are happening. I hope you have a good, reputable antivirus / antimalware running.
Please open Notepad++, go to the ? Menu, select Debug Info and Copy debug info into clipboard, and paste it into your response in this thread. This will tell us something about what version of Notepad++ you’re using, and what plugins are loaded.
After you provide the exact download location you got it from, and the Debug Info, we may be able to better help you with your problem.