AR9285 - 9.0 unusable on my laptop

After months of struggle I had to revert to 8.x on my ASUS N53J laptop with AR9285 wifi card because of problems which ranged from loss of network connectivity to random freezes and restarts. Before I gave up, I joined freebsd-wireless mailing list and asked for help. I was instructed to upgrade to -CURRENT, which I did. Freezes and restarts remained. Then I appled some patches which list users sent me, without success. I filed a PR, as instructed. At this moment, there are 133 problems reported, of which around 80% are related to ath driver.

How come I have no problems with ath on 8.3-RELEASE? Shouldn't 9.0-RELEASE be stable at least as much as previous release?
 
They are from different 'branches'. Patches need to be transferred to one branch or the other. This can sometimes cause what's know as a regression.
 
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