iMessages not being delivered every now and then

Hi,

I use an iPhone 15 Pro with iOS 18.1 and a MacBook Pro M3 Pro with MacOS 15.1. I am currently facing the same issue as in this thread. I have tried everything mentioned there, but I am unable to fix it.

Furthermore, it only occurs at times, and on my MacBook Pro. It happens a few times, and then it fixes itself. During those times, I have to use my phone to text the person or use iPhone mirroring. It is very inconvenient. And this is not with SMS, this issue occurs with iMessages, and it has occurred only with 2 people so far. I am not even sure why it is occurring in the first place. This happens when I am actively texting that person. Suddenly, it stops sending the messages and shows the warning. And then, I have to switch devices to text.

It would be great if I got a solution to this problem, and not wait and hope that the next software update fixes it.