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There are several reasons may lead to iMessages lost, like iMessage saving settings, insufficient memory and so on. You might need to rule out those possible causes and see if you can recover those lose messages. Honestly, it would be a little hard to recover your iMessages without any backup, but there are still some little tips you can refer: How to recover deleted iMessages from iPhone.
For further reference, it would be better to get into the habit of regular backup. Just enter into settings > iCloud > backup and select to automatically backup, which will be your best and easiest way to recover lost data.
There are several reasons may lead to iMessages lost, like iMessage saving settings, insufficient memory and so on. You might need to rule out those possible causes and see if you can recover those lose messages. Honestly, it would be a little hard to recover your iMessages without any backup, but there are still some little tips you can refer: How to recover deleted iMessages from iPhone.
For further reference, it would be better to get into the habit of regular backup. Just enter into settings > iCloud > backup and select to automatically backup, which will be your best and easiest way to recover lost data.
It is hard to say exactly what happened, but have you checked in Settings to see how long you have it set to save messages? Also, why would you not have any backup? That is the quickest way to lose any data. Remember the iPhone is a portable computing instrument, and should always be backed up. That is the only way to recover data. You can set iCloud to backup daily without any interaction from you when the device is connected to power and wi-fi. You also have the option to backup to iTunes whenever you connect to the computer.
iMessages Randomly Deleted
