I'm sorry to hear of your wife's symptoms. It must be very frightening.
I have to say, you've got me pretty stumped on this one!

Does she have her original battery from the implant in 2004?
Where is the battery implanted?
Have you contacted the company's representative regarding this?
IF she still has her original battery, the IPG will eventually reach a point when it's battery fails to hold a practical charge

has she made any recent changes regarding how she charges her unit...such as, is she near a possible source of electromagnetic interference while charging.....
Does she get a fever with these symptoms you describe?

Has she had an MRI? That would be a big no no.
I hope all her healthcare providers are aware she has the SCS.

Any recent lifestyle changes, such as working near certain machinery that could potentially affect her charge....

Does she have a pacemaker also?

Since these new symptoms have only recently presented themselves, I would make certain all her healthcare providers are aware of what's going on, as she may have a new diagnostic issue....

These were the issues that came to mind.....you don't have to answer all those questions.....I was just throwing some ideas out there.

Have you contacted the physician who did the implant?

I'm sorry I seemed to have posed a thousand more questions to the ones you asked!
This is certainly something the medical professionals need to be aware of !

Have any of them advised her to turn the stimulator OFF for a period of time to see if her symptoms continued to present themselves?

Please let us know what you find out!

Meanwhile, I pray for answers to you and your wife....

Rae