Teamviewer session freezes when connecting over LAN

[nuclear]

Hello
The setup is as follows:
PC With Ubuntu 14.04 64-bit with TeamViewer 11
Phone (Sony Xperia Z2 with Android 5.1.1)

I am connecting from the phone to the PC. When connecting over the Internet (the phone uses it's mobile connection or any non-local Wi-Fi network) there are no problems with the communication.

The problem:
When connecting over LAN (the phone uses it's Wi-Fi connection so that the phone and the PC are in the same local network), the following happens:
1. Connected and viewing what happens on the PC
2. After a random time (5-10 seconds) the display freezes: All applications are responding, but the phone's Teamviewer does not "refresh" the display from the PC. However, Input works, I am able to click stuff on the screen
3. 5-10 seconds after the display freeze, the input stops working too.

If I reconnect, the same happens.
It happens only over LAN, regardless if I use PC's Teamviewer ID or PC's local IP Address.
There is no problem, when connecting from the phone or from other PCs, when over the Internet.
There is no problem when connecting from this PC to other PCs.

[matt]

This might be a 'loopback' issue on the modem / router
Also check your Isolation for wifi connected devices in your home router...

Are you trying to connect via LAN within TV, or just doing normal TV connections?

[nuclear]

Both LAN and normal connection.

I think, I found a solution - On the phone's Teamviewer went to Settings and unchecked the "Allow UDP" checkbox and no more freezes for now.

[matt]

Yep UDP is frequently blocked on firewalls that could well explain your issue (starts via TCP then switches to UDP once established, but fails due to UDP being blocked)