I have a strange issue with Word 2016 (Office 365) of one of my customers. When Word 2016 is opened the first time the user pastes in content via clipboard, word hangs for about 20-30 seconds and remains unresponisve for this time. All following copy&paste actions occur as fast as expected until Word is closed and reopened again. The issue occurs on all computers of the customer and it does not matter if plain text or a complex object is pasted. The customer uses Lenovo ThinkCentre Workstations (relatively new hardware of 2017), Windows 10 1703 with all patches applied and newest Office 2016 from their Office 365 tenant.
I already tried checking/disabling AddIns/Plugins and creating a new normal.dot without success. If Word is opened in safe mode, the issue does not occur.
Has anybody experienced the same behaviour and a solution to this or an idea what I can try/check?