Franzia boxed wine change?

Hello! Before I post, please don’t tell me I shouldn’t drink boxed wine or anything like that. I like it because it is cheap, and my roommate and I drink a lot so it is nice to be able to have such a large quantity so we don’t have to rebuy it all the time. For the last 5 years or so, my roommate and I have been drinking Franzia most nights of the week, specifically the pinot grigio box. We sometimes drink large quantities when we are watching shows together. Recently, in the last week or 2, we have both separately drank a moderate amount of wine in a night; say 4-5 glasses (not crazy for us at all), and the next day have had a RAGING hangover the entire next day. It was so horrible for me that I couldn’t even move until noon, and the whole day I was having an extreme headache. Does anyone know if they have changed something about this wine lately, such as adding a cheaper ingredient or something? It just seems awfully weird that this happened to us both, and we are both pretty heavy drinkers so hangovers are usually not like that.