Had the same problem. My apparent solution, an “APC UPS Battery Backup & Surge Protector, BE600M1.” (Amazon)
“UPS” stands for “Uninterruptible Power Supply.” My unit has 5 “surge only” plugs, 2 “battery backup” plugs and a “USB” charging port.
My X-Carve Controller and Laptop are plugged into the battery backup plugs and all my peripherals into the surge plugs. Roughing carves are 2-3 hours, finishing 7-8 hours… no interruptions… zero.
Note: Just added a “Ring” Video Door Bell next to my 1000mm to monitor the long carves remotely. Also, the UPS is plugged into an an Amazon Alexa Smart Plug, while the overhead shop lights are plugged into a separate Alexa Plug. So, when I, remotely, see the spindle has finished a carve, I can shut the whole shop down, X-Carve, lights, etc.