Canadian s6 5.1.1 rooted with custom rom , call going voicemail

Hi evryone . I am currently on the xtresto lite rom but this issuse persisted on tyranus rom aswell. This 5.1.1 rom is giving me the issue where randomly calls go straight to voicemail. I read rogers updated the firmware to fix this but since i am on a custom rom i cant take advantage of it. I dont mind returning to stock i jus dont know how. Any help is much appreciated:o

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