Iphone 5s keeps sending text messages late?

I don't know how to really explain this but this problem started yesterday. My boyfriend told me this morning that most of my text messages I have sent him have been delayed & he doesn't get them till hours later. A text I had sent around 5pm didn't come in until 5 am, another text sent at 11pm came in at 5am as well. I don't know what could be causing this or how to solve it. I have an iPhone 5s and my boyfriend has an android. Not sure if it's on my end or his but I would like to fix it as soon as possible. It happened again tonight & it's quite annoying.

Take it to the shop. Chances are your phone has water damage, mine started doing that after it rained and my phone got a little wet. But again, check with the profesionals

My phone hasn't been exposed to any water damage. Never been wet from rain, hasn't been dropped in water, stays out of the bathroom when I shower.

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