i hv 6s.. my problem is that whenever i put my ph on charging my all ph app are doing blinks i submitted my ph on service centre also bt they not resolved my issue whats the problem behind my ph anyone face such type of problem???

i hv 6s 16 gb. my problem is that whenever i put on my ph in charging my ph all app(mostly 5-7 app in single time) blinks . this problem is since from around 6 months i submitted my ph to service centre n they check all bt they didn't find any issues regarding blinks app.service centre also checked my charger n cable all good.my ph is up to date now m using latest version 10.3.3 bt still problem comes. what should i do anyone faced such type of issue?? give any advice to fix this problem??