I too have received a new SIM card that refuses to work for longer than an hour before requiring a reboot. Virgin texted me to say they wanted to discus new plans with me but I texted NO as advised as I was happy with my existing PAYG (being a very infrequent user). Two days later Virgin said they were sending me a new SIM due to the trouble I had experienced in the Isle of Man or Channel Islands (I hadn't been to either places). New SIM arrived and was activated but only worked for approx 3 hour before 'No Service' popped up. Local signal is strong and I have to shut down phone and restart for another hour of use. Contacted Virgin and they supplied another SIM. Guess what - same problem! Are Virgin trying to offload PAYG customers?
Welcome to the forums and thank you for taking the time to post.
I am sorry to hear that you are also suffering with a similar issue to the original poster.
Starting from October we are bringing to the end our PAYG services, this will conclude in January 2022.
However this shouldn't currently effect your Sim, what handset are you currently using? Have you tried a manual network search? when you are not able to send texts or make calls what are you seeing on the screen signal wise?