Stabilizing the UVLO feature on a DC/DC converter
Given the additional information that it is an LT8610, there looks like something that can be done. 



The EN/UV input has a 1.0V +/-6% threshold and it has almost no (+/-20nA) bias current.
That's with the input rising, it's 40mV less typically with the input falling.  

You already have a voltage divider on the input. All you need is a resistor from Vout to EN/UV. 







simulate this circuit &ndash; Schematic created using CircuitLab

When the UV input is RISING, \$V_{OUT} = 0\$ and thus it will trigger at \$V_{IN}\$ =\$ 1.0V \cdot \$\$(R1 + R2 || R3) \over (R2 ||R3)\$

It is easy\$^{TM}\$ to show that the hysteresis: is \$0.04V\cdot\$ \$R1\over R1||R2||R3\$ + \$V_X \cdot( \$ \$ R1 \over R3\$), where \$V_X \$is the output voltage.