This remote battery draining issue as well as malfunctioning battery pop up warning on the screen have literally been happening for years. Roku can't make a voice remote that functions properly, in all that time nothing has been fixed. The same exact complaints just keep coming in with no fix.
Every time someone makes this complaint we see they get the same inane response by the moderators here. Asking you to paste your serial number and other device info, telling you to reset your device, unpair/repair your remote, change batteries etc. Then possibly send you a brand new remote (that's also defective) and nothing ever changes.
It's obvious that Roku is not serious about fixing this problem and the people who work for Roku that moderate this community are nothing more than parrots copying and pasting from the same help script over and over again, they can't actually help but are appearing to give us the illusion that Roku is doing something about this when it's the exact opposite.
Whether these moderators send in our complaints or not I have no idea, but if they do they are being ignored by the technical people at Roku who manufacture the remotes. My guess is that Roku is completely aware of this problem, they don't have a solution to fix it and they don't want to spend the money to design brand new remotes that actually work, because it will be too costly for the company.
It's funny I never have any issues with my voice remotes on my Fire TV devices that I own, only Roku. Maybe it's just time to switch to a better product and drop Roku entirely. If enough people do that maybe it will motivate Roku to actually take this defective remote issue seriously.