I have a Bluetooth mouse (an Apple Magic Mouse). Sometimes it gets unresponsive when scrolling, where there is a lag before the scrolling starts.
The fix is simple. On a Mac, go to System Preferences > Bluetooth and delete the mouse and re-add it. If you’re on Windows. go through the control panel and do the same.
Why does this work? Well, it appears that interference with other devices causes the lag, so the delete and re-add resets the connection.
And the reason why is down to interference. It’s pretty obvious, but working in modern offices mean there are plenty of sources of electromagnetic (EM) interference which might prevent devices communicating with each other as they should.
Your laptop, tablet, smartphone, wireless keyboard and mouse, and any other device that connects wirelessly all use a section of the EM spectrum to communicate. As the number of devices increase, the more likely that part of the spectrum is going to be congested, much like cars on a motorway.
Some of you may be aware that this is often an issue for Wifi. The wifi spectrum is divided into different channels, and older routers used to all be programmed to pick out a specific channel (often channel ‘1’ or ’11’). If everyone were to use the same channel, this would be inefficient as these would be clogged up and other channels would be clear.
Newer routers, however, seek out the best channel to use to give you the fastest speed.
In the same way, Bluetooth devices can be affected. Although the Bluetooth specification means that devices should switch channels automatically if there is a problem, often it doesn’t do a good enough job.
To demonstrate this point, I placed an active Mifi device next to my computer. Following this, my mouse was having all sorts of problems. Deleting and re-adding my mouse solved the interference issues.