S4 Won’t Send SMS/MMS… Sometimes

My S4 fails to send about 50% of my texts. They just don’t go through. Whether I’m in high or low signal areas. And there are specific people I cannot send MMS to – it fails as soon as I press the send button. Other people it will send to with no problems. The people it fails on are able to receive MMS from other people with no issues. I’m on Verizon. Failures happen with Handcent as well as stock app. Have tried with wifi on and off. Have rebooted the phone repeatedly. 4G data is turned on. Failure to send texts seems to be random, not just to specific users. I don’t expect my texts to fail to send when I have 4 bars of 4G service. It’s maddening.

I’m starting to wonder if I have a faulty S4. It also has rebooted itself three times in the last few weeks. When I reboot it, I can’t get it to boot back up. It gets stuck at the Verizon logo. I have to turn off, boot into recover, and hit reboot device from there for it to power on correctly. There have been several times when the phone has frozen during the night and I’ve woken up and the phone is so hot I can’t touch it. It’s plugged in but not charging. I’m afraid it could explode if I’m asleep and don’t notice this happening.

I’m running stock, no root. I’ve used Buzz Launcher, Nova Launcher, and Apex with the same issues.

I purchased the phone from a Verizon rep on Craigslist. I’m concerned Verizon won’t service it since I wasn’t the original owner… Any suggestions are appreciated.

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