As per the Statistics page I have not breached any limits.
https://mobilebindu.000webhostapp.com/
The next day it works again.
It seems this is happening when I save or update a new post.
Maybe this is related to below post
server
Too many requests can cause WP to hang on the free hosting when you’ve too many plugins etc.
As this is free hosting, there are going to be limits. However, what is available on the 000webhost free hosting platform is often abused by spammers. Because of this, we have implemented a new policy that limits the number of concurrent MySQL connections. These new limits are as listed below.
30 concurrent connections (per database)
max_queries_per_hour = 15000 (DB read)
max_updates_per_hour = 5000 (DB write)
These limitations are already at a premium level and are subject to change …
