@Tommy I doubt about the last seen hour thing over chat, as tell you what last seen thing isn't for you actually it's for others, like if your texting your friends using whatsapp sometimes on top of their name it'll show last seen say 30min ago and sometimes it will show online if your friend is active over whatsapp and for some of your friends it will not show last seen, it's just because that guy has configured his privacy settings,
so I don't think that's a problem anyway did you ran a check over the Wi-Fi connection like see if it has access to internet because sometime it happens !
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