Can any one please help me?

I'm on an iMac with macOS Sierra 10.12.4 (was on 10.12.3 few days ago but Radium was acting the same)
Radium version: v1.4.5.0

I've been trying to sync my Radium-Qt wallet for more than a week now...
sometimes it downloads very few blocks and stops but 99% of the time it doesn't download anything.

Screenshot:
http://i.imgur.com/xuaxLIn.png
(This is the current state, I've been keeping the wallet open for hours each day. Usually I have 2 or 3 active connections to radium network but sometimes only 1)

P.S. I have XBC / PPC / BTC wallets as well, they all download blocks very quickly every time I open them (so I assume the issue is not from my side).