How about that for a machine talking back
I hear ya. My Bernina also does not like old thread. Some will work and the thread that won't I just take to my Mom's and use on her "like 1000" year old singer..... lol Her old singer will sew anything with anything.
On another note I have things that have been passed to me from my Mom which were passed to her from her Mom. My Mom was born in 33 so now you know how old some stuff is. Some thread was shot and broke and some was great. It is all used up now. I went through it pretty quick when the sewing bug bit about 15 years ago. I made Katie all kinds of shorts and dresses with all the fabric, lace, thread, buttons, and other stuff. I say good luck, shop smart, store carefully, and work to get to that retirement you all deserve and enjoy!!