Not sure about warranty thing , you should ticket directly to seagate .
As i told , just have a little unallocated space on ssd . Another thing is capacity of this drive actually 128GB but you can use 120GB , some blocks will start to die after 3000 erase cycle , died blocks will be replaced from this missing capacity ( 128 - 120 = 8GB Spare Area). Spare blocks can last around 1 year.
Dont worry for heavy usage , i installed visual studio on my SSD Plus 120 and my pc works 8-9 hours in a day with web browsing. Age of disk is 8Months and i still have 180 Maximum Write Cycle Count(according to SMART). SSD PLUS can handle to 2000Cycle without speed decreasion and 2700Cycle without any bad block. After 3000 Cycle , ssd will start to use spare sectors (the missing 8gb capacity) and it will finally die after 3200-3300 cycle. :smiley: