Most of our school is still using VGA for projection. We would eventually like to go to HDMI but that is going to take at least a couple years. The laptops (HP Elitebook 850 G5) we are getting from the Ministry of Education only have HDMI ports now so we are using HDMI to VGA adapters.
The problem is that (in many areas) we are finding that when using an HDMI to VGA adapter the image is cutting out for a few seconds every 10 seconds or so. It doesn't seem to matter what model projector is in use (there are several). We have tried a couple of different adapters and can't pin down the cause.
Here is the adapter that we most commonly use:
Are there some really expensive adapters we need to make this work reliably? Is it just not a good idea to use HDMI to VGA adapters at all? Is there even a difference between adapters? Why do some of them cost a lot more than others?