my first instinct would be to suggest upgrading to 2.9.3. Version 2.7.9 is allmost a year old.
Next, have you restarted electrum, have you tested multiple servers, is your network OK (can you do a telnet to port 50001 of the chosen electrum server), is there still enough diskspace (df -h)?
Thank you for your answer.
Tried every server but looks like no one compatible with 2.7.x anymore.
Problem solved after upgrading wallet and manually changed server because default server
electrum.no-ip.org lagging 2 blocks behind.
