May be you have reached the limit of activity on Instagram. You should stop for 12-24 hours and start again.
You can make up to 1000 likes, 1200 follows or 1400 unfollows, and 300 comments per day. For different accounts, these limits can be different. Especially for new accounts.
We are not hiding that there is possible ban for programs that automate activities on Instagram. There clearly spelled out in the Instagram social network user agreement.
According to our data, likes do not represent any risk to an account, while comments and following are more dangerous, but more effective. So who is banning first? New accounts that registered one or two weeks ago; Empty accounts without any photos; Accounts, which using spam comments like: "Join my account and buy a bag!" or: "Call us now by phone + 7978-161-8764 and order a pizza."
This is tough Instagram limit. Upon reaching 7500 follows you need to unfollow them to continue the work. We recommend to use “Unfollow” option.
As soon as comments are made for media of potential followers, that are made by exact search parameters, chosen by you (cities, hashtags, accounts' followers), not you, not we do not know, who it will be, and what media that person will post.