I have the very first generation of A1200 that i bought the very month the A1200 was released, and its still going strong. I used it from 1992 until mid 2000 and NEVER had a problem.. i have been using it again for the last maybe 2 years now, and its still going great. So i am assuming its a generational thing with the AGA Amiga's. The Escom ones and various other types might have used poor quality components !?.
But i am deeply concerned that one day i may not have my 1200 functioning anymore. Its not a thought i wish to contemplate very often.