That is normal when you lose your contacts and do an external backup. WhatsApp thinks I am texting large number of strangers whereas I already know those contacts. Happened to me. Lost access to WhatsApp.
Given what is happening, If the next generation of Trojans get called "bacteria" through intense marketing, with some random functions to give a nondeterministic behaviour, one can not be criminalized of what the bacterias do along their digital living cycle.
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