Whirlpool refregerator temperature roller coaster

[patvac]

Hi, i have a problem with my appliance, the freezer doesn't have a constant temperature the freezer was hotter than usual and it unfreeze. Lately
 the temperature variation where higher than usual.

After a quick check, i open the bottom grill and the back and i have done a good clean with compress air

the  refregerator temperature passes from 33 to  46 and more and the freezer from  -4 to 23

i had to set the selector lower than usual to make sure everything is ok

any info would be appreciate

it's a 2002

Model Et9ftkxkq02

thank you