Cannot search in mail, online or android app

Cannot search in mail, online or android app

Zoho Mail
When type anything to search, it keeps searching forever. Is there a problem with servers? 
I can send emails, however. 

This started today in my web client. I tried Firefox, Chrome, fresh login. The same is for my android app.
Latest android app on Galaxy Note 5 (but installed a week ago, but the problem is just now).