I was actually reading this over and over and I wonder if someone that knows Phil can check in on him to make sure he is ok??
I actually knew someone who had a TIA (transesthemic attack) which is like a miniature stroke and the only reason they found out was because for a few days he was writing his words incomprehensible. His speech at times was slurred. Took him in did a brain MRI and he recovered with meds/time/tx. He didn't even know that he was writing wrong or speaking slurred at the time.
Hopefully this is just his phone, but if anyone can check on him and give him a ring or stop by I think that might be a solid idea.