I don't know what else to do to fix this issue for you at this time, sorry! I've noticed the same thing happening occasionally while banking so I'm thinking it could be client related. I'll keep you posted about this.
I normally resort to a paid bot (Qosmiof2's Quality Herblore) and that seems to be able to run forever without getting stuck.
No problem buddy! If you ever find a solution do tag me
Thanks man.