Need help diagnosing intermittent and temporary partial freeze

I've been experiencing an intermittent and temporary partial freeze and don't know how to narrow the cause any further. The main thing I do on my laptop is use Firefox, and about once per hour it will put up a spinning icon and not respond to any input. At this time I can still move the mouse and bring up the start menu but I can't launch anything. I also can't open the task manager. After about 30 seconds all my input will suddenly be processed (windows/programs that I tried to launch will open) and everything will be back to normal. This issue started about 4 months ago.

I ran Process Explorer in the background for multiple days as a test and when the issue occurred the CPU usage was not spiking and often it was <10%. I looked at the event logs and there are no administrative events around the time of incident. For example the issue occurred around 11am today and I only have a single event log from today and it was an error at 9am related to DHCP. I don't think they're related but I do get the DHCP error quite frequently: "Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0x001558C348B2. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server." The network address it mentions is my active wifi adapter and I haven't had any issues with it.

My SSD claims to be healthy according to Samsung Magician software. I've got about 20% of the drive free. I'm typically only using about 50% of my available RAM.

In device manager I see no error icons.

Not sure how to diagnose this issue further. I'm tempted to switch to a different browser, but the fact that it seems to lock-up more than just the browser indicates a more fundamental issue. Any advice appreciated. Thanks!