Nolan has been missing the /s/ sound for a while (we haven't gotten a detection of /s/ in the Ling sounds in about 2 months), but the past couple of days have brought a lot of sound confusions and "WHAT YOU SAY?"
Here was today's Ling sound check (hearing aid microphone only, no FM system, at a distance of six feet):
He does slightly better with his FM system (he only confuses /ooo/ for /mmm/ and omits /sss/ with the FM system on - it eliminates distance as an issue, since my mouth is within 8" of the microphone).
Still, the loss of /sh/ and the confusion of the other sounds is fairly new. I hope we get them back!