Try adding some more nodes.

Open the wallet, click 'Help', select 'Debug Window', go to the 'Console' tab

The console tab is like command prompt.

Now go to any bitmark block explorer, https://chainz.cryptoid.info/btm/ for example. Head to their 'Network' section. There will be a list of all the public nodes you can add.

So click the node list of the first Sub-version, you can add all those nodes if you want.

The command you would input in console for the first one is "addnode 104.236.59.201 add"

Just keep adding them until you have connections on the network. If that doesn't work, which I've experienced, you might want to backup the wallet and do a fresh reinstall