Some android users have been suffering from delayed or inexistent notifications since November. The issue mostly affects Gmail on Nexus devices running Marshmallow (but other apps, devices, and Android builds have also been reported). Two weeks ago, Gmail 5.10 rolled out but the updated app only fixed synchronization for Hotmail accounts, not other types and most importantly, not Gmail accounts. At the time, we knew that the more pervasive sync bug had been identified by the team, but that the fix hadn't been implemented yet.

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