A number of HTC One X owners have come across a bug on the handset which means they're not always notified of new messages.
Some users have reported that their One X intermittently fails to display the new message notification in the status bar and the counter badge on the messaging app icon.
The knock-on effects are obvious, users could go hours without knowing they have a new SMS - only finding out when the messaging app is opened.
Only small number affected, fix on the way
HTC has confirmed the issue exists, but claims that it only affects a small number of One X handsets.
The Taiwanese manufacturer also confirms it is working on a fix for the issue, which it will roll out as soon as possible, but no exact date has been provided for this update.
The HTC One X is an excellent phone, scoring 4.5 out of 5 in our full in-depth review, but it hasn't been without issue.
HTC is hoping its new One series of handsets can help turn sales around, but continued issues with the flagship One X could have a detrimental effect, especially as its biggest rival, the Samsung Galaxy S3, will hit stores at the end of the month.