Woocommerce stopped sending out emails?

Hi Lads
We have huge problem with Woocommerce orders – they get lost and order numbers skips / jumps from 2096 to 2130
and those orders that actually makes it …. get set to cancelled – but the money and transactions are done ok!
(I created SUPPORT tickets in IThemes security Pro that we also uses … But they really gave me a horrible answer (Censor)!!

But the “paper-work” is missing (no emails or order confirmation?) is beeing sent??
Weird
Please adwise
From time to time when doing a order to be paid by manual bank transfer – the email got sent … Then we removed the “Hyper Cache” to all shop files + chart and so.. That didn’t help but was proberly good.
The Sucuri people lowered their cache – And claimed that was working – Nope!

I found this:
https://kriesi.at/support/topic/the-mails-arent-sending/#post-382306

But I have checked and rechecked every settings in Woo and can’t find anything wrong??

Can someone tell med where is set the “STATUS” of new order? In my own shop it is always: PENDING
But in this shop with the problem – it’s sent to “CANCELLED” when it fails (fair) but in normal credit card mode “TEST” it get “Waiting Payment”?
(Maybe I should ask Woo People)?