HTC’s Vive Wireless Adapter released for $300 back in late September for Vive and Vive Pro, but some users running AMD Ryzen CPUs who’ve had issues with the wireless adapter are now being urged to return their unit, as HTC is still figuring out what went wrong and how to fix it.

“We have seen and are actively looking into multiple reports of Ryzen incompatibility with Vive Wireless Adapter,” the company writes in a recent blog post. “Our current data shows this is occurring with a subset of Ryzen-based PCs. Our investigation will take time as we are working with multiple component manufacturers to identify the root cause.”

The issue, affecting some Ryzen users, appears to serve up a nasty bluescreen on the headset, something that isn’t cleared up after rebooting or any other trick known at this time.

Pending a software fix, HTC is urging affected users to return the units in the meantime—possibly a sign that the Ryzen issues goes deeper than anticipated.

Starting today, HTC says they’ll be honoring Ryzen-related returns from retail partners and vive.com “outside of typical return windows.” After contacting customer service, users will be asked to certify their system’s components and proof of purchase of the Vive Wireless Adapter.

The company says that moving forward they’ll be making sure users know some Ryzen PCs have unresolved compatibility issues.