App that opens new uifigure with zoom function stops responding occasionally

I built an app in App Designer that allows users to select a range of data in the plot with the zoom function, then returns the trimmed data back to the main app. At first it works fine, but if I call this selectSignalRange function for a few more times by clicking the button, sometimes it just stops responding with no error message. It's not greyed out completely, but nothing happens when you click a button in the app or editor window. You can't even close the window. When this happens the only option is to force quit Matlab completely and start over. I'm quite sure it's not a bug from my code, but how do I make the code stable?

The main app:

~
~
function TrimsignalButtonPushed(app, event)
    [app.simSignal, app.signalRange] = selectSignalRange(~~~);
    drawnow; pause(0.05); % I read from the internet that this line helps prevent crashes
end
~
~

The function:

function [simSignal, range] = selectSignalRange(simSignal, range)
    fig = uifigure;  % opens new uifigure window
    ax = uiaxes(fig);
    drawnow; pause(0.05);
    plotSignalinUI;
    zoom(ax,'on')

    % Create push buttons
    uibutton(fig,'push',...
             'ButtonPushedFcn', @(~,~)simTrimBtnPushed);
    uibutton(fig,'push',...
             'ButtonPushedFcn', @(~,~)finishBtnPushed);

    uiwait(fig); % To prevent outputs until finish button pushed
    
    function simTrimBtnPushed
        range.sim = get(ax,'XLim');
        simSignal = ~~~; % Edit this variable
        ~
        ~
        plotSignalinUI;
        drawnow; pause(0.05); 
    end

    function finishBtnPushed
        close(fig)
    end

    function plotSignalinUI
        plot(~~~) % Plots stuff in the window
    end
end

[Voss]

Would it be possible for you to share the entire code? Perhaps upload the .mlapp file?

[Shao-Yu Wang]

Sure. There are several functions, but I only included the relevant ones.