EM client 5 stuck on a random folder while syncing messages (gmail)

Hi! I am using emclient 5 to access gmail. The program syncs all folders I have in gmail (6-7 folders with old mail plus sent mail etc, about 7 gbs in total) and gets stuck on a random folder. While it is stuck, no messages can be received or sent.
I like emclient, I just switched from Outlook, but if this is a problem that will persist I will have to go back - what a pity! Any help will be appreciated.