I have been having long load times and a number of APIException errors lately when trying to use an app.
It might be that this instance is having more and more users, and the server load is high? There is also this reproducible issue: https://monero.town/post/1135619
If the server upgrade is necessary, probably many users are willing to chip in. These issues may be magically gone after updating to v0.19, though: https://monero.town/post/1135619 since the new version appears to be “very fast according to some new posts”.
PS. Sometimes “Post” doesn’t work either, taking forever and not posted.