[manyhats]

You can check model and possibly buy new internal – external filter or replace a new sieve bed from online sources but problem might be in the computer board that’s faulty. Fault codes found in manual or online. I had G5 go bad with board where filters/sieve had no effect and but my G3 just I dropped in new sieve and worked as new.

[manyhats]

Do Your homework On Doctors And Don’t Be Afraid Of Second Opinions.
Went in for flare up with a new pulmonologist and got a six minute walk. No ex-ray or cat at that time . A few months later ex-ray from family doctor led to finding a lung mass. A different pulmonologist ,a good oncologist team and chemotherapy it’s now less than half approximate 8cm x 8 cm original size . Not the same as your choice as mine was squamous cell and to late for surgery ,radiation or immunotherapy. 9 years IPF 1 year cancer and still 91/o2 sitting.
Homework and prayer are my best recommendations