Carrier Aggregation on Airtel 4G LTE

Speeds have become worst after Carrier Aggregation is disabled in my Circle.
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@Ak5877 CA is disabled in whole TN. When I was in train and when the train crossed AP border roaming symbol disappeared and even 4G+ icon disappeared. Even checked my classmates phones Nobody's getting CA on Airtel.
 
What maybe the reason to disable CA across all bands? Doesn't looks like they're refarming 3G spectrum coz in some places still no Band 1 and still DC - HSPA is working.
 
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