I found current dungeons was the worst and have lot of bugs.
Sometimes my dungeons friend not showing. 
Sometimes msg also not showing. 
But lately I couldn't move to nod from first room. 
I turn off game 4 times I switch to WiFi inasted of mobile data. 
Too many tries to join my room again with my partner it's not allowed to me to join. 
Please fined this
 https://youtu.be/DOlYq85C5Qw
https://youtu.be/DOlYq85C5Qw