the cubes keep freezing together into a big lump
After how long?...a few days, weeks?
If left unused for a while the cube will freeze toegther....we use to dump ours out once a month and let it make new cubes.
Other trouble makers...
- high spike in temp during defrost
- wide temp switchs when the refrigerator is going on and off
- air leak
- icemaker is leaking water into the tray