Containers gone after Windows Server 2016 reboot

I’m new to Docker. Successfully configured docker, created three containers, one containing a PHP site, a container with mySQL, and a container with data.
My application runs fine after installation. After rebooting, only one of the containers remains (the one with mySQL) Running evaluation copy of Windows Server 2016 Standard. Any ideas what can I check/change for containers not to be wiped out after a reboot? Thank you!