Web Player instances report that they are STRAINED is not necessarily an issue and you do not need to recycle the instances nightly. STRAINED means that you're reaching the limit of your physical resources but it does not mean that there's a problem. As a matter of fact, when the Web Player reaches STRAINED, it does not change it's behavior at all.
The Node is using 74% memory in the image.
By default the status STRAINED is set when used RAM (on the machine, as seen in the task manager) reaching above 75%, and will be set back to AVAILABLE whent he usage goes below 70%.
These levels are configurable in the service config.