Just like everone else here, I have had all the sames issues from slush ice, to solid block of ice, to water under the chrisper drawers, and loud ticking from the fan hitting encased ice on the coil under the back panel of the frig with ice coming out the air vents.
Purchased a RF28HMEDBSR/AA in Dec 2015 and for the first year it worked great, no problems. Everything went south in that 2nd year and Samsung refused to help and told me to call a service rep and that I was going to have to pay for the cost.
For the past few years I did all the defrosting, even bought a steam machine so I could quickly defrost this thing as a hair dryer or heat gun is just too slow and you can easily damage the plastic parts, steam works really well.
I decided to either fix this thing myself or just write it off and dump in on craigslist. I did replace the icemaker with a newer model as the old one was so corroded and nasty.
I think that there are multiple issue with these units and that is one there is not a simple one solution for all. I did the Y clips on the cooling coil and the drain clip on the refrig coils and so far the unit is once again making ice, and no frost or ice build up, for how long we shall see. Also found the fill line extended too far into filler and repositioned that correctly, that could have been spraying water that then iced up the icemake and fan.
The one issue that most are not talking about are the 3 drain tubes in the back of the refrigerator and those small rubber drain valves that allow water to drain into the evaporator pan but don't allow air back into the drain lines. Mine were full of gunk including a piece of insulation material and crud. When I removed them water poured out of 2 of the drain lines. This could be the source of moisture air that is condensing on the cooling coils.
Make sure you clean out those drain valves and see if it helps
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