Because you pay for a script doesn't exclude you from being banned. Keep in mind you're cheating and botting is against the rules. However, I've ran my account for 12 hours a night on a fresh level 3 and I have yet to experience what you have. Nonetheless, good luck.
Also, you should check this out https://osbot.org/forum/topic/124429-preventing-rs-botting-bans-v2/