No pressurization after some moment on 707

[RHW The What]

I was flying peacefully on my 707 at around 30.000ft and suddenly...

"Attention! No pressurization!"
Afterwards, the plane started to slow down & descend uncontrollably

Did the autostart miss something? Or did I miss something? Or is this a glitch? What can I do to solve this?

[Alant]

It sounds as if the engines failed for some reason.

[Husky Dynamics]

Haven't flown the 707 in a bit but I believe there's a cabin pressurization valve located on the right side of the engineer panel, you might want to make sure that it's closed. Also (as Alant said), your engines may have experienced an unintentional shutdown.