Remotes with power/volume/mute buttons connect to the Roku via Wifi-direct over the same wifi channel used by the Roku to connect to your home network. If you have a lot of congestion on this channel from nearby routers, there is some indication that this causes the remote to work overly hard to sort thru the conflicting signals on that channel and thus drain the batteries quickly.
If you have access to your router's setup, try configuring it to use a different WiFi channel to see if this helps the situation. In the 2.4 GHz band, channels 1, 6, and 11 do not overlap each other and so give you the best chance at reducing congestion, so try each in succession, although depending on what channels your neighbors are using other channels may work best. Also, reducing router bandwidth from 40 to 20 kHz may also reduce interference.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
