Can you try 5.0.7 and disable Connection > Optimize connection buffer size?
Thanks for the reply! I've just tried your advice but the result is completely same. When the upload is started, the upload speed about ~300Kb/sec or more but three seconds later 0Kb/sec and disconnect from internet and local area network. Than I have to run the Network Diagnose in Network and sharing center or I have to restart the computer.