S3221QS, speaker delay

Hi all, I have a Dell S3221QS attached to a Microsoft Surface Laptop Studio via DisplayPort to a Surface Thunderbolt Dock. In general, the integrated speakers work well, but I've noticed there is frequently a delay of a couple seconds when I start playing media before the speakers start playing audio. To be clear, I'm not saying there's an AV delay. The audio is synced perfectly, but there's a delay of a few seconds before it I can hear anything.

I've ensured the monitor is using the latest version of the DDPM console and monitor drivers. 

I've noticed this delay with other computers connected to this monitor, and I haven't noticed a similar delay when I connect other speakers to the devices. Any suggestions? Thanks!