Video streaming stops after 20 -30 minutes

You can put the parameter ssdp_beat_time anywhere in the twonkyserver.ini
Your actual twonky server version is displayed on twonky server status screen http://hostname:9000 (where hostname is your WD My Cloud IP address). There is probably twonky server version 7.2.9-6 bundled with actual WD My Cloud firmware 2.11.168.
Latest (paid) twonky server version for current WD My Cloud EX2 is here http://www.twonkyforum.com/downloads/8.5/twonky-WD_MyCloud_02.xx.xx-arm-8.5.zip
For other hardware/firmware/twonky combination you can search here http://www.twonkyforum.com/downloads/
The basic manual how to install latest twonky server manually I found here https://community.wd.com/t/uprgarde-of-twonky-dlna-server-to-8-3/176393/5

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