Wireless Charging stopped working; Could it be a software issue? (Samsung Galaxy S3)

I've had a Samsung Galaxy S3 for a few years, I even upgraded to a newer model, and revered back to my trusty ol' S3 because I missed it, and was and was happy with it's size & features. Eventually the USB charge port stopped working (a common problem on this model). Replacement part is under $2 but microsoldering & board repair are beyond my skill level, so I got a 2nd battery + external charger, which I've been swapping out twice a day for six months. It's a bit of a pain, so when I realized ***Qi-style Wireless Charging*** could be inexpensively "retrofit" to my device, I was thrilled! The transmitter & receiver pad arrived yesterday. I placed the pad under the battery cover as instructed (touching the previously-mysterious 2nd set of charging contacts), put it on the transmitter, and *voilà*, my charging headaches were solved! It charged faster than plugging it in [used to], and even worked with my rubber case attached. **Hooray!** *Until the next day.* **:-(** Today the phone does not detect the wireless charger. I've tried restarting the phone repeatedly, tried two batteries on each of two receiver pads (they accidentally sent 2 instead of 1), tried with/without case & cover, and even different power sources & cables to the transmitter. **None of these steps worked which leads me to believe this is a software problem... Is that possible?** If I can't get it working I'm obviously going to send the parts back and go back to constantly swapping batteries but I'm hoping someone has a suggestion. Could there be settings I am unaware of? When working, *Ampere Meter * app said it was charging wirelessly at 1050mA. Receiver pads are rated for 800Ma; Batteries are 3.87v/7.98/Wh/2100mAh. As I recall it would charge around 650mA back when the charge port worked. Photo is similar receiver pad, on same model of phone: Samsung Galaxy S3, rooted (with no other issues), running Kitkat 4.4.4. - Link to [Samsung Wireless Charging Support](https://www.samsung.com/us/support/answer/ANS00047798/) .