Game will run fine for a little while, long enough for me to get partway through an activity, then consistently hit me with a PLUM and a BattlEye Timeout. I've made sure Windows is up to date and validated my game files through Steam, no change.
[b]ETA:[/b] On a suggestion I rebooted my PC twice in succession, complete restarts both times, and weirdly enough that seems to have fixed it. For now at least.
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I just made a post about this myself, but try deactivating any software such as Razer Cortex/Synapse and MSI Afterburner. If you don't use these, check for any of the software listed here: https://help.bungie.net/hc/en-us/articles/360049199891-Destiny-2-PC-and-Third-Party-Application-Feature-Compatibility This seems to have resolved the plum issue for me but I am going to check more in-depth tomorrow.