Turned Whirpoll ED22PE off and moved to install

If the water valve is leaking a bit, it will cause freezeup, as will a flow restriction. The 'water splashed inside freezer' sounds like leaky shut-off valve.

Sometimes those 'saddle pirecing' water shutoff valves get restricted, so you are not getting enough pressure.

Also, if you had things disconnected, a little bit of grit may be in the filter or shut-off valve, causing issues.

I would:

a) check the house water pressure, to make sure it's normal

b) check/clean/replace fridge water filter

c) inspect/replace saddle valve and look for kinked water feed line

d) backflush water out of fridge, if possible, and look at clean/inspect/replace water valve.

Although they do make add-on heater kits for water maker feed lines, your issue just sounds like a water flow issue...either a leaky valve or a flow restriction.