I have no idea why but it seems like suddenly my bluetooth connectivity has issues. I have a Harman Kardon Onyx and it has been working superbly well since the first day I bought it.

I check the Bluetooth pairing page, it's paired and I opened the Sound control panel and noticed the bluetooth speaker appeared in the window but with a red downward arrow attached to it.

Everytime I "un-pair" and "re-pair" it, it stays connected for a while (with the green tick symbol) but when I tried to play audio over it then it just gets disconnected.

I've tried pairing it with my iPhone and it works =(

Windows 10 performed a major software update a few days ago so I don't know if it's that =/

you can try reinstall the bluetooth driver and see if it works. btw which bluetooth adapter do you have? you can find this out in device manager.

if this is a problem with new drivers from ms, you can disable automatic driver updates to prevent this from happening again. press win+x keys, select system, goto advanced system settings > hardware tab > device installation settings.

I went to Device Manager and uninstall the speaker from there and then reinstall it by pairing it up again. Still, the problem persisted =/

I'm not sure what went wrong. I have done nothing to it, it just happened after the software update so I'm pretty sure it's the software but I cannot confirm.

no i mean your bluetooth adapter. something like this:

Ouh! ok.

Will try that later tonight and see if it works =/

You can also right-click the device and disable the power management option.