I get the same problem and the log shows this:

Could not reserve Thing_Frame_RTR_SteelRoof2794069 (layer: null) for Erik for job FinishFrame (Job_19760117) A=Thing_Frame_RTR_SteelRoof2794069 (now doing job FinishFrame (Job_19760117) A=Thing_Frame_RTR_SteelRoof2794069(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Crica doing job FinishFrame (Job_19760105) A=Thing_Frame_RTR_SteelRoof2794069 (toilIndex=1)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Could not reserve Thing_Frame_RTR_SteelRoof2794096 (layer: null) for Crica for job FinishFrame (Job_19760151) A=Thing_Frame_RTR_SteelRoof2794096 (now doing job FinishFrame (Job_19760151) A=Thing_Frame_RTR_SteelRoof2794096(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Ezra doing job HaulToContainer (Job_19759571) A=Thing_Steel2791754 B=Thing_Blueprint_RTR_SteelRoof2786914 C=Thing_Frame_RTR_SteelRoof2794087 (toilIndex=4)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Could not reserve Thing_Frame_RTR_SteelRoof2794087 (layer: null) for Ezra for job FinishFrame (Job_19760315) A=Thing_Frame_RTR_SteelRoof2794087 (now doing job FinishFrame (Job_19760315) A=Thing_Frame_RTR_SteelRoof2794087(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Crica doing job FinishFrame (Job_19760309) A=Thing_Frame_RTR_SteelRoof2794087 (toilIndex=0)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Could not reserve Thing_Frame_RTR_SteelRoof2794106 (layer: null) for Blue for job FinishFrame (Job_19760350) A=Thing_Frame_RTR_SteelRoof2794106 (now doing job FinishFrame (Job_19760350) A=Thing_Frame_RTR_SteelRoof2794106(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Crica doing job FinishFrame (Job_19760339) A=Thing_Frame_RTR_SteelRoof2794106 (toilIndex=1)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Could not reserve Thing_Frame_RTR_SteelRoof2794051 (layer: null) for Crica for job FinishFrame (Job_19760364) A=Thing_Frame_RTR_SteelRoof2794051 (now doing job FinishFrame (Job_19760364) A=Thing_Frame_RTR_SteelRoof2794051(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Erik doing job FinishFrame (Job_19760358) A=Thing_Frame_RTR_SteelRoof2794051 (toilIndex=0)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Could not reserve Thing_Frame_RTR_SteelRoof2794035 (layer: null) for Erik for job FinishFrame (Job_19760481) A=Thing_Frame_RTR_SteelRoof2794035 (now doing job FinishFrame (Job_19760481) A=Thing_Frame_RTR_SteelRoof2794035(curToil=-1)) for maxPawns 1 and stackCount -1. Existing reserver: Blue doing job FinishFrame (Job_19760431) A=Thing_Frame_RTR_SteelRoof2794035 (toilIndex=1)

(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 35)

Okay after extensive testing (vanilla save with only raise the roof) i have found the error is from the mod itself and not from any mod conflicts

The error occurs when one pawn has reserved a tile of roof then the other pawns want to go build it but they can't as someone else has reserved it

I have the same issue. My guess, from looking at the behavior of the pawns, is that pawns have a sequence of roof builds queued, but as they are working on one build, another pawn decides to build one the first pawn had later in their queue, so the first ends end up "frozen" waiting for that roof square to be available. The other pawn may be halfway across the map, so takes time to get there, but as soon as that roof square is built then anyone who was "waiting" on it unfreezes and goes to their next thing. When you have a whole bunch of pawns building at once you get lots of short freezes.

force them to build another tile or just draft and un draft usually solves the issue