Hi tkozyrski,
I am not an expert and do not manage vlabs. I would like to add my 2 cents as a fellow community member.
If there are a lot of lines to be loaded for commit; the device might hang instead try loading a few lines to every commit.
The resources made available to you are virtual instances of the devices though very capable to the standards of a virtual machine are not as robust as physical devices ( Limited minimal resources are allocated for free hands-on).
If even a line's long commit is hanging, then try below in the order:
1. Different browser
2. Use an onboard application to SSH instead of web-based SSH.
3. If the issue persists, I suppose you need to write to them via email.
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//Nex