Rented his rig, everything was fairly smooth but it would go down to almost 0 hash every once in a while for between 5-15 min.
I asked him about this and only got an answer the next day once the rental was over saying that it was probably my pool and not his rig.
I did have other rigs connected to the same pools that didn't have those holes in the hashing.
I would rate 7/10
Yes, my guess is that it was up to your pool, because I checked my rigs and everything was fine and I don't have problems like that usually. Hash rate went to zero three times in a row for a short time. I would extend your lease time anyway, but I didn't see message until morning.