Having problem with Bluetooth keyboard & mouse

Well it definitely wouldn't be for "months on end" as you say, meaning it won't take as long as you seem to think. However I have doubts that it's anything other than software or something with the keyboard itself. I wouldn't take your whole Mac in just yet. I've used various new and used Macs for different families of Mac and have NEVER experienced this, so I doubt it's hardware related on the Mac itself.

Have you tried replacing the wireless keyboard? Or at least the batteries?

If not I'd like to know if that fixes anything.

 

it may take WAY longer than your think.

i purchased this last gen 5k iMac THE DAY it launched. and it had BT issue ever since.

 

and i've been to apple store for more than 8 times. and checked this computer in for >20 DAYS in total. all they told me was 'software issue', though it happened right after complete fresh install, even at the computer set-up screen (the grey one that ask you for a user name/password stuff)

and if you bring it to the store, it will probably only cost you days and you'll get nothing to solve the problem.
here's what 'genius' has told me:
1. interference (though i tried to use same KB/mouse with FOUR different macs at the same spot, none of them have ANY problem what so ever)
2. keyboard is bad, though i've tried to switch 3 different sets of keyboards, including the brand new magic 2 series + magic KB
3. software.
4. we 'cant recreate the issue', though i have >10 video clips showing the problem, including one took right at the apple store
5. BT is supposed work like this..... seriously? a $3000 computer is suppose to have problem with BT while my <$1000 macbook air doesnt?




so, this problem has been there since like 10.10.1 (or maybe .2), don't expect Apple to fix it anytime soon...



ps. they've replaced logic board (i have no idea why to replace it instead of airport card), doesnt work neither. and all diags they will run will return 'fine', so they will refuse to replace the airport card

 

So you had one bad experience overall gary, doesn't mean that's how everyone else's will be. If Apple took "months on end" to repair everyones computer they wouldn't have the stellar customer service rating that they have, so yeah, I think it'd be fine.

Sorry you had issue though.

Besides I suggested a far more simple and immediate solution. Also there's no need to spew ignorance suggesting there's a fundamental issue that "Apple won't fix anytime soon" that's BS, as I've yet to find any sort of magnitude of threads suggesting other wise.

If it is a software issue, just wait, Apple will fix it soon.

OP I'd be curious if it was just a battery thing or if the keyboard itself was at fault.

 

I have experienced (and reported) the BT mouse drop-out on my 2012 rMBP since Mavericks. It's not always, and sometimes it comes back on its own... but sometimes it requires a system restart to get it back. It's quite annoying, to be honest. The latest El Capitan beta (10.11.1, build 15B38b) does seem to be much better in this regard, at least for me.