Graphics problems

I recently installed SC remastered and I’m getting large rectangular patches that keep flashing irregularly in a chequered pattern. There are often several of these patches at once. If I scroll somewhere else an return to the same place on the map they often disappear but soon reappear. Any ideas?

My system is up to date with all new drivers installed.
I’m running Windows 10 on a Thinkpad X1 2Gen with Intel HD Graphics 5000 / 8GB Ram / SSD / i7.54550U 1.5GHZ