I got a 7.3.2 dnn website, already running since  some years; in the last weeks,  i started to receive an error "DNN site unaivailable" or "connection to database failed"; i must restart IIS site every time.
I noticed this happen when i manage users or roles; sometimes saving some update, sometimes only accessing to profile; i tried to delete every account (except host manager) but the problem remain. i tried to delete roles too, but is still the same. I need help to investigate in DB or in configurations to solve this problem. The site is a school site. thank you in advance.