Thanks for the update. I will go through them. Meanwhile, I have observed this instability has been increasing rather than decreasing.

Search engines are supposed to become more efficient, but sometimes they start displaying rankings which are 2-3 months old. I tried to access from various datacentres, but several of them were in reverse mode. This temporary reverse rankings phase used to stay for 1-5 days, but it seems to be increasing over the past few months.

thanks for your reply

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