#StackBounty: #16.04 #performance Ubuntu occasionally hangs even with low CPU load, free RAM and free space available

Bounty: 100

Sometimes my Ubuntu 16.04 LTS (i3 and 4GB RAM) system hangs so badly that I cannot copy paste text.

I normally have System Monitor open to monitor my usage, and when I check it I find that I have enough resources for hang-free usage.

System Monitor shows CPU load 5-10% with only 1 spike >50% and around 50% free memory

What should I inspect? System Monitor seems unreliable? I have enough HDD free space.

Get this bounty!!!

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