Many Apple Watch Series 3 users have recently had difficulty installing updates to the watchOS operating system.

In the past, Apple has suggested that users temporarily delete apps and music before updating, but now the recommendation is that users who have problems with the update should restore the system completely.

The reason is that there is extremely little storage space in the Apple Watch Series 3 (the GPS version of the Apple Watch Series 3 seems to be the worst affected due to it’s 8GB storage), which means that there is simply no space for the temporary installation files.

As a consequence, Apple is expected to raise the system requirement for Watch OS 8, an upgrade that will be released sometime in the fall, and this could leave the still-on-sale Apple Watch unsupported, reports 9to5Mac.

This article originally appeared on Macworld Sweden. Translation by Karen Haslam.