I once had such masses of spots because of a crappy fixer, but for Efke is reported many times that the plaster fell from the ceiling if a truck passed the machine hall and so spoiled the whole production. So there are many reasons why Fotokemika died, the quality problems are surely to name in first sight why nobody wanted their films anymore.
It's a pity for films like the IR820 of course. Just a sidenote: a highly improved version of the Efke 100 is the Adox CHS 100 II (made in Germany!), a beautiful film based upon the historical Adox/Efke emulsion, top quality as we are used from the "big 3".