I have an LSWXL 6TB on a Mac network. It is rendered unusable by the continual alert message

I've just had lunch and come back to a stack of five warnings. Clear those and another five appear - it posts them every 15 secs or so and you have to clear it to carry on. I've reset the firewall preferences and deleted and set again. Nothing stops it. Firmware up to date.
I suspect it is an incompatibility between Mac OS and the drive format. I can't format the drive to Mac so unless anyone has any ideas I have a redundant piece of kit. Never been used (can't get past this problem), other than re-formatting to configure for Raid 1. Any ideas or offers? Based in Guildford UK. Help!
Cheers, Clive