Sometimes my s8 wifi connection shows that "internet may not be available". when i off my mobile wifi and turn on again its work. After few minutes it show again and internet not work. would anyone please tell me what is the problem about my wifi??

(S8) my camera lens is clear. but when i open camera apps picture are not good and the picture full blurred and dull.Sometimes camera apps give a notification "A clear lens take good shots"Thehe are any solution??please help.