@cybardev Hi and a late welcome to the community. 
I am a community member too. I can’t help you with your problem, sorry. Just throwing some general steps you might try to provide more information that may help support staff.
There were previous issues with PWA crashes a few releases back which were fixed. I searched for others reporting this issue within the community, on reddit, and on Brave GitHub issues and couldn’t find anything. If you have found anything, please post an update. It will help determine if this is something unique to you or a new bug or regression that is not yet widespread.
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This topic is a past report of PWA issues. It has some troubleshooting steps you may want to investigate: Updating to 1.35.104 breaks all PWAs I linked the specific things to check below.
Updating to 1.35.104 breaks all PWAs - #4 by sampson
Action: Check for crash reports at brave://crashes. Follow instructions in post if have crash report(s). Also post the crash ids and tag the moderators in your post.Updating to 1.35.104 breaks all PWAs - #9 by sampson
Action: Check to see if behavior is occurring in other Chromium based browsers. Post an update on results. -
Do you have any extensions installed? Try disabling extensions and see if problems still occur. You may also want to clear history/cache, exit the browser, and reopen.
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Create a new test profile and see if the issue is happening in a new profile.
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Does the same behavior occur in the Brave Beta and/or Nightly versions?
Please post an update. Be sure to tag the moderators in your update, especially if you have crash ids. Hope this helps!