There's a problem with Viber app on my iphone?

It is about 3 days, that I have problem with Viber app
I can't send txt or call, sometimes it takes to long to send, I don't receive any txt and couldn't answer to any call. Most of the time when I want to send a txt it is remaining in "sending" status and fail after waiting for 10 mins
How can I solve this problem?

I don't know what to tell you

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