Dual screen temporary image loss (Dell Laptop with USB C dual HDMI)

I have a Dell Latitude 7280 with Win10 Pro (Version 20H2). This has a Thunderbolt USB C port.
I use 2 external screens (27" and 24''), resolution 1920x1080. Both screens have HDMI connections and are not 4K.
I don't use the laptop screen which remains off.

I bought a USB-C hub (not Dell branded) with dual HDMI outputs (Resolution can only reach up to 3840x2160 4K@30Hz HDMI can display up to 4K) so that I could use dual screens as the laptop only has 1 HDMI port.
https://www.amazon.com.au/gp/product/B087WSLDN3/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1


I have a frustrating issue - on some websites (same ones all the time), when I click a link on the page, both external displays loose signal or connection for about 15 seconds, then eventually come back on. Each time a click a link on these pages the behaviour repeats. (Websites e.g. Bose.com.au, Catch.com.au). However most websites are perfect)

Can anyone advise the likely cause? Could it be the USB hub (I assume it's not a bandwidth issue as my screens are not 4K), a cable, a missing driver, inbuilt graphics, BIOS setting (I do have the most recent BIOS installed)?

I Googled this earlier and see some advice is to install a Display Link driver, but not sure if I have a DisplayLink chip.

Here is a YouTube link showing my issue

Dell laptop screens go black - YouTube

Appreciate assistance or advice. Thanks

Ghot said:

@larrens

I'm no expert on laptops or "hubs" for that matter, but from your laptop's specs... isn't that a lot of screen real estate to drive with an Intel 620 graphics part?

Yes, I wondered that. I am not running graphic intensive applications and this issue I have is very rare. I have only experianced it on 2 / 3 websites. Its just frustrasting.

I found this on an Intel forum - and I took from the below that it should be able to handle my basic needs:
Intel HD Graphics 620 can, in fact, simultaneously support three independent 4K (3840 × 2160) HDR monitors running at 60Hz.
First, Intel HD Graphics 620 support:

• Processors including Intel HD Graphics 620 support three independent output channels. These channels can be configured to support DisplayPort 1.2 or HDMI 1.4a.
• If configured for DisplayPort 1.2, an output channel will have a data bandwidth of 17.28 gigabits per second. You can connect one, two or three monitors to each output channel. If multiple monitors are connected to a channel, they share that channel's data bandwidth.
• If configured for HDMI 1.4a, an output channel will have a data bandwidth of only 8.16 gigabits per second (hint: this will just barely support a 4K SDR monitor running at 30Hz). Only a single monitor can be connected to a HDMI output stream.
• Processors including Intel HD Graphics 620 support a maximum of three independent monitors. Even though you can physically connect up to nine monitors (using DisplayPort 1.2), a maximum of three will be supported.
• The data bandwidth for a 1080p monitor at 60Hz is 3.20 gigabits per second.
• The data bandwidth for a 1440p monitor at 60Hz is 5.63 gigabits per second.
• The data bandwidth for a 4K SDR monitor at 60Hz is 12.54 gigabits per second.
• The data bandwidth for a 4K HDR monitor at 60Hz is 15.68 gigabits per second.

Ghot said:

Maybe check the version numbers for your Display port and HDMI.
I guess it could also be the hub. I've never used one.

Also, I'm just a bit skeptical about Intel's claims on this.
Remember that you're really driving three screens. Don't forget the laptop screen.

Thanks - how do i check the port version numbers? Is that in device manager?

(also, the laptop screen is off. I am not using this, only the external displays)

@Ghot Thanks for your help.