Offload SES email extremely intermittent email delay

I am getting very random intermittent email delays. Problem started about a month ago. Noticing it with woocommerce new order emails. Generally emails send /receive almost instantly. On occassion emails are 15 minutes to 2 hours delayed. Activity in Offload SES shows it sent on time. Email logging plugin shows it sent on time but somehow the mail server? isnt sending immediately. This client uses offload SES for website email service. We use mailster to send campaigns but that hasn’t been done in couple of weeks. They also use microsoft outlook to send business emails in general (not from the website).

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