Nick Howitt wrote:

It is not normal at all. Have a look at the output of "top" when this is happening. Look for excessive processor usage and low memory. Are you using many power intensive apps (Proxy/Content filter, IDS/IPS, QoS/Bandwidth Manager)

Hi Nick,

Sorry for the late reply. Been a busy month! finally got some time to spend back at home.

This is the output of htop:

With looking at bandwidth, this is the speeds: