Dell Latitude E7440 CPU speed capped after sleep

My Dell Latitude E7440 laptop came with Windows 8.1 at the time I bought it. I did not notice this problem until I upgraded to Windows 10.

Sometimes when I put the laptop to sleep and resuming at a later time, the CPU speed is limited to around 0.78 GHz and switching to High Performance mode won't help. The computer becomes very slow and the only way to fix it is rebooting.

I have the latest BIOS installed (A15) and other drivers are also updated.

I have seen other threads saying that the problem is caused from using Dell Power Companion but I am not using it. I have 2 power adapters that I use with this laptop, one of them is a Dell 90W adapter. I am not sure about the other one as I do not have it right now, but that one originally came with the laptop.

Any temporary/permanent fix for this? Thank you.