Barometer & Temperature reading zero

With the firmware 2v16.10 I have a ~50% chance of undefined for Bangle.getPressure(). This is from the IDE:

Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
{ "temperature": 29.57211303710, "pressure": 1008.98850875296, "altitude": 35.54039353922 }
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
{ "temperature": 29.57535298665, "pressure": 1008.98815103067, "altitude": 35.54338200327 }
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
undefined
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
{ "temperature": 29.61423238118, "pressure": 1008.98636565159, "altitude": 35.55829733279 }
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
undefined
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
undefined
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
undefined
Bangle.getPressure().then(d=>{
: console.log(d);
: // {temperature, pressure, altitude}
:});
=Promise: { }
{ "temperature": 29.68842061360, "pressure": 1008.98390526754, "altitude": 35.57885179204 }