I have been dealing with this exact issue since around the end of March without finding a resolution. It just suddenly started happening. The firmware had not changed, so the only thing I can come up with is the possiblity of a Windows patch released around that time causing it. I've tried all the settings/changes mentioned here. I'm replying here both to share that you're not alone and to receive updates. I have been able to confirm that using AnyConnect does indeed resolve the issue, but I would far prefer to keep using the built-in client due to the expense. The ones writing the check are asking the very legitimate question of why should we shell out another 3 grand to do something we've been doing for free all this time.
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