QGIS » QGIS Application

Many times now since installing QGIS 3.4.2 i have had QGIS crash on me. So far as I can recall it has all been when working on a project set up by somebody else about a year ago, but re-saved by me recently. I've tried 3.4.2 and now the latest version 3.4.3 (downloaded today to try to fix the issue).

The crash happens variously when:
+ Closing QGIS (high probability of crash)
+ Opening a project with missing layers and going through the 'browse' function to re-assign the layers
+ Occasionally when working on the project with no obvious reason (not running plugins, etc.)

Crash ID: 5ad41d6be94809f981e2ec9b06a0e20f1d0b0a87

Stack Trace

proj_lpz_dist :
proj_lpz_dist :
QgsCoordinateTransform::transformPolygon :
QgsCoordinateTransform::transformPolygon :
QgsCoordinateTransform::QgsCoordinateTransform :
QHashData::free_helper :
QgsCoordinateTransform::addToCache :
QgsCoordinateTransform::invalidateCache :
QgsApplication::exitQgis :
QgisApp::~QgisApp :
CPLStringList::operator char * __ptr64 * __ptr64 :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.4.4-Madeira
QGIS code revision: f6ddc62fdb
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 2.4.0
Running against GDAL: 2.4.0

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.17763