why is FNAC so consistently inconsistent?

I've been experiencing a wide array of issues with FNAC lately.

I won't get into them all, but one that is really irking me is when I browse to the FNAC home page via HTTPS, I login successfully, I click on any navigation item (i.e Inventory) and then I immediately lose connectivity to the UI and am not able to reconnect. Only via a reboot is the page restored.

I also lose SSH access. The only remote access that remains is via console.

We are in HA and that does not invoke either. FNAC still responds to ping so presentably that is why.

Kinda getting sick of it.