How to stop continue optimise app in Yu Yuphoria?
After googling found only one way to get rescue of it.

You must need to do force restore factor. Use Below Step

1) Reboot your Device

2) When your mobile ON instantly press Volume Down Button + Lock Button

3) You mobile will be gone on boot mode 

4) Select 3rd option Restore factory

5) Select Option for Delete whole data select YES (Might be 4th option) 

6) Formate will be started (It will take approx 15 min)

7) When It will completed again your system will be display boot mode. You should choose Reboot Device 

Congratulation your device will be worked as normally.