Refrigerator rime query? I have 4 refrigerators and 2 ice machines that adjectives have the...

I have 4 refrigerators and 2 ice machines that adjectives have the same problem. They formulate ice but the ice at the bottom of the tray freezes into a solid lump and is not usable short removing the tray and breaking the ice with a tack hammer. I first thought that frequent opening of the door affected the rime, but some are rarely opened. I do live surrounded by a warm climate but the top ice is man made and not thawing. All friges & machines are clean and ably ventilated. The temp is right on all. Any concept??
Put hose down filters on your icemaker supply lines. Purified water freezes much better and the rime is less likely to stick together. I don`t know the door seals are bad.
Your problem is FROST
A deposit of minute ice crystals formed when water vapor condenses at a heat below freezing. This crystals get solid when they get surrounded by contact with a solid and cold surface such as the ice, Therefore forming a solid rime block.
You need FROST FREE refrigerators and ice machines.
Cheers
Answers:    It's simple science, water freezes as 32F, for some reason your freezer is going above this temp. If your not constantly first performance the door than either your temp is set low enough or the thermostat is function or the compressor isn't properly working or your gaskets around the door are not seal properly.
I never have this problem but, my freezer is cold enough if you would touch your tongue to sometime metal surrounded by it, your tongue would freeze to it (just like the boy on the flag pole in that elderly Christmas Story)
If 6 appliances adjectives have the same "problem", look for the adjectives denominator.
Are you constantly opening and closing the door? (Some are rarely open.)
Is the temperature set correctly? (You can adjust the temperature lower, but avoid freezing foods within the refrigerators.)
Are the door seals bad, or the thermostats and compressors unsound? (On six appliances at once? With that kind of luck I don't want to be standing next to you!)
Or is this a usual condition?
The refrigerators are frost free, which means the freezers are periodically warmed up to wipe out the frost and then cooled to freezing temperatures again. This is the root frozen foods develop "freezer burn" and go bad over time. This is continually softening and refreezing your food and rime as well.
The ice author appliances usually have manual defrost, so you must periodically shut them rotten, defrost and clean them. The best ice author appliances are equipped with drains and have a cycle that melt the bottom layer of ice and drains it to keep hold of the best quality of ice. Less expensive models are not equipped beside drains, and do not have the ice melt function.
All ice will begin to fuse together over time, whether commercial rime you buy from the store, or snow in the Himalayas (did they leave the door unequivocal too long?).
So re-read your owner's manuals again for proper operation and maintenance instructions, turn rotten the ice makers you use infrequently, and expect to verbs the other units periodically. It seems fairly normal to me.