Problems connecting to remote database with recent pgAdmin versions

Hi,

I've been experiencing problems viewing tables and running scripts on a
remote database (accessed using pgremote) with version 3.4 and 3.5 - I
never had similar problems with earlier versions on the same remote server
database. When e.g. selecting "view/edit last 100 records" for a table, or
when opening a query tool window, I get a small red "disconnect" symbol but
no error message of any kind.

It is erratic, though - in periods everything works fine, then it starts
failing again. During failure periods, I've also noticed that retrieving
meta-data (properties, SQL) is very sluggish (but usually working, so the
db IS connected)

I suspect this is related to some change in a timeout configuration, but I
don't know which and/or whether this behaviour need to be addressed through
a pgadmin configuration setting or a configuration setting on the server
side (the latter has not changed, but I obviously cannot rule out that
there are changes in overall internet connectivity speed/bandwidth)

Any thoughts on how to resolve this?

Regards
Calle