DVI connections do not support audio, only video.
This sounds like you are using an HDMI port that supports both HDMI an DVI, apparently testing to see which one is connected.
Have you tried the Roku stick in a different (presumably non-DVI) HDMI port?
Edited to add.... Check your TV settings to see if you can disabled DVI on that port.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X