what would cause the inability to contol my mouse?

Bluetooth devices become unresponsive

Bluetooth Interference Sources

Bluetooth Interference Sources (2)

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If your Wi-Fi is capable of generating a 5 GHz signal, try that.

Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time.

Reset NVRAM/PRAM

Are these actions operating with anything akin to focus or purpose? Because if that's happening, then you may have somebody remotely accessing your system. As a test of this, disable networking — disconnect from your ISP at your modem or cable box preferably, or disconnect your Wi-Fi device from its network connection, or switch off Wi-Fi or disconnect the wired connection locally — and see if the problem stops. If that does help, I'd go to another computer and/or another network, and post up some details.

if the actions are not operating with any sort of purpose or focus, then see the links that Eric Root has referenced. In addition to looking for interference, also try a wired mouse, disable the Bluetooth devices, and see if that wired connection works more reliably.

If those links do not help...

If you've installed add-on performance enhancements, security tools, anti-malware tools, anti-virus tools or anything that claims to protect or optimize or clean, remove it, and try your tests again.

One of the easiest way for folks here to spot the more obvious add-on software is by downloading and running and posting the diagnostic and configuration report output generated by the Etrecheck tool. There are examples of that posted around the forums, if you want to see what that tool does and how it works.

If you've installed anything recently, or have had remote assistance or other tools installed on your system, disable or remove those.

Web cookies are entirely unrelated to mouse tracking.

In any event, get a full backup of your entire system to external storage.

You are welcome.