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From: Hal Murray <hmurray@megapathdsl.net>
Subject: Re: pl2303 lockups on rpi2
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 of "Fri, 17 Jun 2016 19:55:18 PDT." <20160618025517.GA38492@www.zefox.net>
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fbsd@www.zefox.net said:
> The problem seems to move with the adapter from one RPI2 to the next, which
> suggests a bad adapter, but I'm wondering if it might also be a driver
> operating on the edge. 

How solid is your power?

I've seen USB screwups on a Pi 3 running Linux talking to a GPS unit with a 
PL2303.  The symptom was that every day or two, it just stopped working.  
Unplugging and replugging fixed it.  I didn't find a way to fix it from the 
command line.

Somebody suggested that a Pi-? needs more than 4.8 V.  My setup was running 
at 4.8 V.  Power seemed like a likely problem, but I didn't track down the 
source.  It could be a handy urban legend.

You can get USB cables with heavier gauge power wires.  I got some Tronsmart 
brand.  They gave me a bit more than an extra 0.1 V, but I don't have enough 
hours on them to know if it solved the problem.


-- 
These are my opinions.  I hate spam.