Whatsapp messages missing randomly
I am facing strange issue on iphone 6s iOS 9.3.1 with latest version of whatsapp installed.
Randomly some of the incoming group messages are not delivered to me. I could come to know about those missing messages through my spouse phone where she is in that group.
Other observations about the problem :
I can see, repeating I can see, notification for some of the missing messages but can not find in my chat box. Some of missing messages even dont appear in push notification. Many time I see repeated push notification for same missing messages (thrice or more times) but those message don't appear in my chat window.
I re-installed whatsapp 3 times but no luck. After suggestion from apple support I reset all Settings but that too did not help.
Please let me know if any one has faced such issue and if any solution of the problem.
iPhone 6s, iOS 9.3.1