Never had a connection problem with Whatsup.i don't use any tweaks though.Just the fn9 and the jolla.theme.Maybe it causes conflicts with tweaks or somethin.In a clean device as mine Whatsup has never shown major problems..except the small bugs og status or profile pic.
Online status ok
Conversation ok
Response ok
Features All i need which means ok
You know what solves the ploblems?
Cooperation, patience and donations.
CHEERS