I have a 2007 T5 which also had a cruise control issue.
In the beginning it would randomly turn off cruise control on the highway.
This intermittent issue just became more and more common until finally the cruise control did not work.
My VAG COM never showed an error anywhere.
I tried removing the top plastic cover (where you set/reset cruise control) and cleaning all contacts with electrical contact cleaner / isopropol alcohol, however this did not fix the issue.
What WORKED:
I ended up removing the stalk, which actually wasn't that hard. I then used a multimeter to check continuity on each of the wires. I found that one of the wires (black I think) wasn't working.
I simply pushed a new piece of thin wire through the plastic stalk and used a soldering iron and tweezers to carefully replace the faulty wire, which is part of a ribbon cable.
This completely resolved the issue and a year and a half later I haven't had any issues.
I highly recommend you check continuity with a multimeter. The cost of a replacement stalk was crazy when I looked.
If you are not confident with a soldering iron or multimeter then at least try to remove the stalk and take it to any electronics bloke (not a car guy, an electronic repair place, eg tv, appliance, computer repair). Just ask if they can use a multimeter and soldering iron.
They should be able to test continuity and solder in a new wire for you which would cost no more than $20-30. Literally a 5min job.
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