bro, this problem is caused by the interference from 5G mobile signals which uses same frequency band of C band satellite transmission. Also some 4G/LTE towers use the C band frequency for their tower-to-tower backhaul communications. all these causes interference for satellite tv channel signals in C band. Same interference is reported from everywhere this frequency spectrum was allotted for 2 different usages. you can see some detailed White Paper articles published in the website of Asiasat group in this topic. Very soon this issue will come in India with the commencement of 5G services here.
regarding your advise on using inverto : Inverto brand is famous only for the Ku band LNBs sold in middle east which has superior quality and gain. whereas, their C band LNBs are not even available nor its known for any superior quality compared to brands liek Eurostar, Gardiner etc. please avoid giving wrong advise without much information available