Reaper, Renoise & Rewire - Sound Glitch While Looping

Hi. I am using Reaper and Renoise via ReWire. I have a section in my song that I am looping over to record some multiple takes but I have noticed that when the loop “rewinds” back to the start position, the sound clips off and goes quiet for a period of time. This doesn’t happen when I use Renoise on its own.

Can somebody please help me in identifying a setting that I may need to adjust to stop this from happening? This is probably more of a Reaper forum question than Renoise but perhaps some of you may have experienced this before too and could possibly help me out?