Server hangs every 1 Hour

I have this server than hangs every 1hour for about 5 mins and then continues working and most time it happens when posting POS Invoices and Sales Invoices. When i check processlist at these periods, i see this taPacked item stuck on the list for that period of time. When i kill the process before the 5 minutes wait, the server continues working fine.

Please i need help on how to identify and fix this issue