Do you have lens optimization or highlight protection (I think it’s called d-max or D1/2 something like that) turned on? You don’t need those if you shoot RAW and it’s been to slow buffering with those features on.
No, I don't have lens optimisation or any other JPEG-relevant settings applied, because I only shoot RAW. There's no point in applying JPEG settings unless you shoot JPEG.
Also why do you drop your batteries and from what height? maybe you could try dropping the camera, that might knock something back in place.
Er, haha, "dropping" batteries is simply how most of us refer to the procedure of opening the battery door, allowing the battery to drop a centimetre or two, and then pushing it back in. It would be pretty idiotic for anyone the deliberately drop or knock a camera (I assume you were being sarcastic). My R5 has never been dropped or knocked, so it's extremely unlikely that there are any loose connections.
I still don't think you can base that off of reported lockups here. Like how many R5 bodies are out there currently? And how many have reported lockups? I bet the actual percentage is lower than you'd think.
There are clearly enough complaints about the "freezing" issues to indicate that there is some kind of malfunction affecting certain batches of the R5. I don't believe the issue is caused by firmware (if it was, it should have been fixed long ago), and I've been shooting as pro (and now amateur, having retired) for several decades, and have used multiple camera systems, so "user error" is extremely unlikely.
IMO, the issue is probably caused by a batch of faulty components. Clearly there are plenty of people who *don't* have these issues. That indicates to me that only certain batches of the R5 are affected.
There is also the (unlikely) possibility that what Canon likes to call a "rare phenomenon" happens when a certain combination of settings is applied. However, I've already reset my camera to default settings a few times to test that theory, and the freezes still occur with Canon's default settings (when I'm shooting SERVO AF, animal-eye AF and one-second hi-speed bursts).
You might note that it's quite common for Canon and other manufacturers to downplay any issues affecting their cameras, and try to correct them via firmware updates. To date, none of the updates have eliminated the freezes.