I've been in management for restaurants/Pubs/Bars for the better part of a decade now, during the first few years, I'd always receive calls, and messages during my days off and holiday and I got pretty tired of it, especially when it would come from my bosses.
To combat this, I bought a cheap smartphone that's able to run apps like email, WhatsApp and calendar, as well as having a pay as you go SIM so it keeps the cost low.
Once I get home from work, I put it on charge, and mute it. No one from work has access to my personal number, and I do not receive work related calls and messages when I am not at work.
I also created a separate email address for the same purpose. Work stays during work hours.
If you're able to do this, I strongly urge you try it.
It will feel weird at first, as we usually feel obligated to respond to work related matters at any time, but after a while, it feels great knowing that once you walk out that door, it is no longer your problem.
I have trained my management team well and they can solve any problem without my assistance and have the same level of authority when I am not in the business. I also don't contact any of my team outside of work, as I believe they are entitled to their own personal time when they also walk out that door.
If your employer does not give you a company phone, and you are able to afford it. Try this.
Mine and my partners life has become much more peaceful because of this.