Watch offline feature

[apollokill]

Got a question, going on a trip and during the flight was thinking about watching a series but I was able to set 5 episodes to watch offline, after that any other I try to add it says :
"Cache is full, please remove some from you cache and retry"
Already cleaned up storage from the app and cache from android app but still can't download more to watch offline.
Is there a limit ? hard to find information about it...