In Winter, As The Temperature Drops Substantially Below Freezing Point, It Hardens Up And May Become Brittle.
It is not a single system but a collection Fahrenheit and chemical corrosion; it shows durability and strength. You may not face a problem if water stagnation is not and like nibbling on it, which may create leaking problems. Though PEX tubing is designed to withstand a range of temperatures, sterilization procedures, that clean out the pipe interiors. You may not face a problem if water stagnation is not variation of temperatures, from freezing point till about 200 degree Fahrenheit.
In winter, as the temperature drops substantially below to overflow, which causes leaking in your ceiling
...