Problem synching emails - no mails have come through since yesterday

I’ve been using the free version of EMClient for a few years without problems.  About a month ago, my mails stopped coming through, even though I got them trhough my gmail account and via my android phone.  The only way I could could get it to work was to uninstall and then install again, but it took literallly hours to synch all my mails and subfolders again.

Since yesterday, my mails are not coming through again, and I’d like to find a solution that avoids needed to uninstall and re-install. Any ideas?