I read the first page and searched this thread and didn't find this info. All we have are our original magic bands, so I am sure they no longer work. I was looking at a new Magic Band +. However, several reviews on Shop Disney report the band stopped working on their first trip and no refunds/exchanges were allowed, no matter how new it was. I don't mind buying 1 or 2 new ones, but I would be super upset if I spend $35+ and it stops working our first trip. Are these reviews outliers, or is this a known problem?
Your original bands will still work for TAPPING... see ->
https://www.disboards.com/threads/disney’s-magic-band-faq-link.3875647/page-18#post-64754681
The MB+ bands need to be re-charged. If you don't, the lights, vibrations, interactive, and "gaming" features stop working. Just to be safe, charge them every night, although to be honest if you are not doing Fab50 Quest or Batuu Bounty Hunters, you can probably charge every other day or every 1.5 days. IF you do Batuu Bounty you'll likely have to charge the band DURING THE DAY. We also carried at least one MB+ charging cable in the parks with our powerbank (i.e. portable battery that we charge our phones with).
The charging clip/cable doesn't always "snap" on, although it might seem like its on right. You need to be sure the charging clip is securely attached to the band, and the band's LED is pulsing to know its charging, otherwise you could wake up the next morning and your band isn't charged.
I currently have six MB+ bands that I have not had an issue with. Three of them from my October trip, I re-used on our trip a couple weeks ago. I did not have any charging problems. Nor have they "died". I like wearing a different band each day, and one that matches the park... Yup, I'm weird like that.

Our son took two MB+ bands he had from October, and one new MB+. He too didn't have any issues.
That being said, the issues we've had with MB+ bands have been around the initial bluetooth pairing with the phone, later re-connecting the bands with our phones for the interactive/game experiences, as well as making sure they were powered on after charging.
On our October trip, it took 4 attempts for our friend to Pair her band with her phone before it finally worked. My wife, our son and I upgraded our phones back in March? and it did take a little doing to Bluetooth pair the bands, that had been paired/connected with our old phones, to the new phones. It took a couple of tries and button pushing.
Once BT Paired to that phone, the bands usually re-connect to the phone just fine, but sometimes after charging we'd have to press the button on the back of the band (light ring comes on green), then open the Disney World app on the phone and go to 3 bar menu -> MagicBands and More -> [Tap Your Name] -> scroll to the MB+ band you want to use that day, and make sure it connects and shows the battery level.
NOTE: MB+ being bluetooth paired and connected to the phone only impacts the "gaming" features of the band (Fab50, Batuu, other things in Play Disney?? Accomplishments maybe?)
The other issue I've had which impacts both MB+ and MB2.0 bands... I find that bands stop working, even for tapping, even ones I used the last trip, IF I have "too many" marked Active. I have just over 60 bands total, plus several "cards" listed in my Disney account (my wife and son have over 25 bands each plus several cards)... On one trip, when our bands wouldn't open the room door, I found that if I deactivated some bands/cards, or deactivated/re-activated that particular band it started working. So now when we are going on a trip, before leaving home, we go into My Disney Experience (web site), under MagicBands and Cards, scroll down the list and deactivate ALL Bands and cards, then go back and activate only the ones I'll be taking that trip. We haven't had an issue since doing this.