Repeated charging notifications

I have an iPhone 5s. I got it about six months ago. I used it carefully all the time, I did not drop it. On the screen there is a protective glass, I use the phone in the anti-hide UAG case. Out of the box, it was installed operating system iOS 10. After the update on iOS 11 began to happen strange things when charging. The phone after some time (usually 7-10 minutes) after connecting the charging re-delivers an audio notification of charging and turns on the screen. Please note that the cable and charger are original, which came out of the box. I thought that the problem is in the cable and charging. I changed the cable to the original one from the kit with the iPad, Samsung Powerbank used it as charging, but the situation with repeated notifications was repeated. With the release of iOS 11.2.5-11.2.6 the situation has been corrected. Yesterday I installed iOS 11.3 beta 5 and the situation with repeated notifications was repeated. Tell me someone else has this problem and what are the solutions? On ios 10, everything was perfect.