Yes Resteeming will use a small amount of your bandwidth, There are many factors in running out. Could be over voting, over, posting, editing your posts, over commenting with a low amount of steem. Likely a combination. You can check your bandwith and keep an eye on your voting power here at steemd.com/@bonkite
I am glad you found it helpful and I hope you have some luck with them! Using them as well as engaging I think makes a difference rather than just depending on bots!