Repair your current device? If that is really not possible get a "smart" one and dumb it down - don't allow any network access or - if it insists on being connected or you want to get some use out of its "smart" functions - put it on a separate network which has no access to the internet. Of and when I'm "forced" to get a new "smart" piece of equipment this is what I do if I can not change the firmware on the thing to something under my own control. I never let any "smart" device access the internet because of a host of reasons ranging from security and privacy to the risks of the thing "upgrading" itself without my approval.