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TPS54290 instability problem

We are having problems with this switching converter.

Sometimes it works fine but sometimes it doesn't...

We think it's related to compensation issues:

When we touch around the compensation area it starts working but when we touch it again it stops working.

What do you suggest?

These are the components used:

Vin = 14 to 17 Volts

V1 = 3.3 V

V2 = 5 V

L1 

http://www.digikey.com/product-detail/en/744775115/732-4154-1-ND/3476470
L2 http://www.digikey.com/product-detail/en/ELL-CTV120M/PCD2153CT-ND/822227
Cout1 = Cout2 http://www.digikey.com/product-detail/en/C3216X5R1A226M/445-6004-1-ND/2444045
Cin1 = Cin2 http://www.digikey.com/product-detail/en/C3225X5R1E106M/445-3947-1-ND/1944444
Res de 20,5K http://www.digikey.com/product-detail/en/ERJ-6ENF2052V/P20.5KCCT-ND/119351
Res2 de 3.3V  http://www.digikey.com/product-detail/en/ERJ-6ENF6491V/P6.49KCCT-ND/110962
Res2 de 5V http://www.digikey.com/product-detail/en/ERJ-6GEYJ392V/P3.9KACT-ND/81757
Compensadores 3.3 V http://www.digikey.com/product-detail/en/08051C681KAT2A/478-1351-1-ND/564383
  http://www.digikey.com/product-detail/en/ERJ-6ENF8062V/P80.6KCCT-ND/119523
 
Compensadores 5 V http://www.digikey.com/product-detail/en/ERJ-6ENF1303V/P130KCCT-ND/119584
  http://www.digikey.com/product-detail/en/C0805C331K1RACTU/399-9224-1-ND/3522742
Bootstrap http://www.digikey.com/product-detail/en/TMK212B7473KD-T/587-1280-1-ND/931057
Bypass http://www.digikey.com/product-detail/en/160R15X106KV4E/709-1229-1-ND/2074921
Snubber http://www.digikey.com/product-detail/en/ERJ-6ENF10R0V/P10.0CCT-ND/118378
http://www.digikey.com/product-detail/en/C0805C471K5RACTU/399-1142-1-ND/411417

Maybe we are missing the capacitor used in parallel with the compensation components in the example of the datasheet