I saw a post recently re a NoobV4 & after servicing it was running a couple of seconds per day off (great result) but the member was wondering why it was now losing around a minute a day. Rough figures (can't find the actual post) but the idea was it was losing significantly more time & the member was wondering why.
I think another member suggested stopping the chrono which he did. And it's now back to a couple of seconds per day.