No, no reason except cost. I've been on year-round for a long time......well, I do take a month off here and there. I'm an older guy, so I enjoy many benefits from GH therapy. Better skin quality, stronger connective tissue, mood enhancement, and a powered up immune system.
That's why I can't say for sure about the IM injections......this was 12 weeks in the middle of a year on. GH changes are subtle.
You might back your dose down a little and see if it helps your hands. After achieving the body comp changes I was looking for, I do fine on a maintenance dose of 2 to 4iu a day.