Unable to send encrypted session key

Teamviewer version: 5.1.17330   (both me and my partners)

 

When I try to connect to most of my TV partners, it shows "setting up secure connection" and make me wait so long without any further process.

I have to let my partners to restart the Teamviewer client so that I will be able to connect to the partner..

It happens few months and I can't stant it anymore.

Below are some of the logs that may help.

2017/11/03 11:44:51.921  4604 12200 S0   Creating 256Bit AES session key
2017/11/03 11:44:51.922  4604 12200 S0   Encrypting and signing session key with RSA
2017/11/03 11:44:51.924  4604 12200 S0   Sending encrypted session key


2017/11/03 11:45:12.940  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=84
2017/11/03 11:45:18.035  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=100
2017/11/03 11:45:45.087  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208068695 L=84
2017/11/03 11:46:24.234  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=84
2017/11/03 11:46:32.764  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=100
2017/11/03 11:46:38.422  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=84
2017/11/03 11:47:20.231  4604 10720 S0   CT510  CT.Receive.CMD_BUDDY_ENCRYPTED From=404998320 To=208061111 L=100