I have an app which has been successfully searching through the API for posts based on their hashtags for about a couple of years, but which has recently been getting erratic results. For example, up until about Wed/Thu it would return tweets containing #AfrikaEye2018 (a film festival). Since then, it returns nothing. It has been retrieving tweets hashtagged #ClimateChange for months, but recently it does so unreliably. If I do a search from a user account with these hashtags, I largely see what I expect to see, although even that doesn’t produce all the posts that have in fact been made.
Has something changed in the API or terms of service? In case it’s relevant, my query seeks only tweets containing videos. I haven’t yet sought approval for the account from which the API searches take place. As I say, it’s been working for two years or so. The API rate limits have not been reached.
Many thanks for any help.