Instagram (unofficial) API returning 400 (Bad Request)

Question

I have been working my way through the Unofficial Instagram-API-python and (in short) what my app did was to download public data (likes per photo) of various Instagram users. After about 24 hours of work suddenly I received the following message

code of 400 (Bad Request)

After checking out the rate limits on the official Instagram API page, I found out that this 400 Bad Request is not linked to limits, but to "spammy" behaviour.

From documentation:

"You may also receive responses with an HTTP response code of 400 (Bad Request) if we detect spammy behavior by a person using your app. These errors are unrelated to rate limiting."

There are similar questions on stack overflow, but none of them seem to provide any solutions. My questions are:

1. Does anyone know what is defined as spammy behavior (not the exact formula, but an intuitive explanation)?
2. Is there around this (through the unofficial API)?
3. It seems to be unrelated whether it's through the unofficial API or sandbox mode / live mode in the official API, so there must be something that people who have created reliable apps off Instagram's API, take into account when constructing their request behavior.

P.S. note that in the documentation, it's explicitly noted that this is not related to the request frequency.

P.S.2 48 hours lated my account could run the same code and there 400 Bad Request was gone, so it was a temporary ban.

Any input will be much appreciated!