I have been following this thread with a lot of interest as I have the same problems duscyssed here.
I have a new iMac Retina 5K and am encountering massive BT issues with my Mouse. I'll pair it after deleting old instances and it seems to work fine for some time and then if the computer goes to sleep, mouse will act funny. It will have basic two-mouse functionality but scrolling and swiping will not work. BT will say that it is disconnected although it is not completely. At this time, I can't even turn off BT and restart and the only way seems to be to restart the computer. Another thing I am noticing is that while start is super fast but the shutdown is painfully slow - 1- to 2 mins before it shuts down. 10.10.1 update did not help much.
After reading all the responses and possible solutions that people have posted, I honed on the interference with WiFi as the most likely source of the problem with bluetooth related devices. Here is something that I have compiled which may be useful for people struggling with the issue.
There is a pretty good article to understand two WiFi bands: http://www.macworld.com/article/1140685/wifi_spectrumbands.html?page=2
I am summarizing some key things from the article below.
The tradeoffs between 2.4GHz and 5GHz have to do with interference (almost entirely in 2.4GHz), range, and speed, three properties that all relate to one another. The more interference, the less speed and range; the greater range you want, the less speed you can have; the greater speed you want, the more you have to mitigate interference and work closer to an access point.
Interference in 2.4 GHz: The 2.4GHz band is a “junk” band—it’s a frequency range that’s heavily polluted. It is used by Bluetooth, Wifi, Cordless phone, Microwave, wireless cameras, baby monitors, etc. It’s one of the most heavily used industrial, scientific, and medical (ISM) bands, which have broad rules to allow equipment that needs to emit a signal to work in within its confines. ISM devices aren’t used for communication, but produce electromagnetic signals as part of their operation. And those signals are interference. The 2.4GHz band also has a host of other competing uses; 5GHz has the distinct benefit of having very little technology that makes use of the band but it . Reducing interference lets networks work at higher speeds and greater ranges.
Some options to try out to see if it helps:
Channel Width - Use 20 MHz to minimize interference for 2.4 GHz and 20 or 40 MHz for 5 GHz phones
Channel: The 2.4 GHz bands uses staggered, overlapping channels, which provides few clear options. The recommended channels for the 2.4 GHz network are 1, 6, and 11 since they are considered non-overlapping channels. For the 5 GHz network, channels 36, 40, 44 and 48 are recommended (the lower four available 5 GHz channels can only transmit at 5 percent of the power of the higher channels. Apple’s new base stations now automatically choose a higher-numbered channel by default if there’s one available. If your station is choosing a lower channel in the 5GHz band, you may want to override that choice and choose a higher channel manually in order to get the signal strength you deserve.) to less likely suffer interference. The 5 GHz band reserves a full channel width without overlap. 5GHz results in significantly less interference but it's range seems quite small compared to 2.4GHz. You can go one room away and not get a strong 5GHz signal or see a network set to 5GHz.
But the bigger question remain that there was something done in Yosemite that all of a sudden aggravated the problems in a very big way. Very disappointed with Apple that they have not been able to resolve this issue which clearly affects many people. I am really starting to wonder because the iOS 8 launch also completely bricked my older devices and I am not happy that Apple did not warn the users sufficiently that this may be the case - the language used should be much sterner given that people can completely lose their ability to use older iDevices. These are not isolated cases and the company that we all are so loyal about is not matching up to the high expectations. There has to be a better response.
- sk1992
