It has been happening about 2-3 times a day since using both the steam and jagex launcher clients. I have cleared the cache with both and it still happening. I'm wondering if I'm the only one with this consistent issue or if there are others and if they have found a solution.
Using Steam here, haven't had any issues but since you got both launchers on your computer maybe a recent update has some files conflicting with each other. I'd uninstall one of them and see if it fixes the issue.