3ds max wierd connecting lines Gigabyte RX 580

Hi My name is Mike

My system is

amd ryzen 7 1700 ( Stock clock speeds )

Gigabyte ax370 gaming 5pro

Gigabyte RX580 XTR 8 gb

corsair 3000hz 32 gb ram (running at 2933hz)

windows 10

3ds max 17 + vray 3.5

software setting (3ds max recomended setting) - Nitrous (Direct3d 11.0  Feature level 11 - Radeon(TM) RX 580 Graphics)

In the view port some wierd connecting lines appear on wireframe between objects and I have attached a screenshot to show the problem.

I think its graphic card issue if so please help me  I have tried all the settings I can think of??

I also have a MSI R9 380 graphics card which works perfectly on the same system and same AMD driver