This issue only started yesterday after I started trying out mods, I assume they are related. I added five mods (listed below) that sounded interesting and started a new game. At some point in the game - after turn 150 or so - I noticed that my yield accumulation per turn (gold, influence, etc.) was staying constant despite building infrastructures or increasing bribes to independent people. At turn 166, I reloaded the autosave of the last turn and the yields changed dramatically (I probably hadn't noticed it for a while). I was able to play a few turns but then the game got stuck between turns and had to be reloaded again. This time, I could not reload the game or any of the autosave files for the last 20 turns. They all gave the following error:

The operation was canceled.

at Amplitude.Mercury.Game.Game+<DoStart>d__4.MoveNext () [0x00157] in <173fc3c1c3214bc89b88c03b179ae28b>:0

at Amplitude.Coroutine.Run () [0x00019] in <479babf06a1f4b9498857d4c8c52dc95>:0

Rebooting the game initially let me load the saves again, but no matter which turn I loaded (I tried 166, 165, 165, and 159) the game was stuck between turns and the notifications were the same as those that originally appeared in turn 166, even though units were in the places they had previously been during those turns.

The same thing just happened today with a new game. At turn 132 I saw yields weren't changing. I saved and reloaded, now all the saves give the above error. The latest manual and auto save files for the game today attached (Umayyads Turn 132.ctr auto-save 2245.ctr). I assume this is related to the mods I installed, but up until the games stopped running, there was no indication of any problems. 

Thanks for the help!

Mods used:

Vanilla improvement 

Eventful

2 and 14 era stars

Dense districts

Better district costs